Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb544a0b5a3f4301…

MALICIOUS

PDF

96.7 KB Created: 2021-07-08 20:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e5a37dedfe0068d4e6caf058a7752a31 SHA-1: f9298623a22d7a92a3e8b51197861c91d53a5965 SHA-256: cb544a0b5a3f4301cd1d7474c512672f737c36f0ef02ca0390d9c10e871afa0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/pedubisibivilepef.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2c0adc0b---86745553189.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/8g689vqbvcq75bcj23kk8547gv/nopisisufopanerababu.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/69410071995.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/repavanisetoj.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/tamorewepimedolikel.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/06c6eb4a097c7549be3175a83a8b257d/dafirovamakojadojodo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fakumupesog.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa91c7323---42938124288.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f14042cb2---bewadagotovemebin.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a704f118---toxevuboniwetezapej.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/xedeveganekutereluwexub.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lua0094891666jhmv2vpk9h2u7/xowudatarefib.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/tenuximusedaj.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/banujefax.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/pewonebonelilaparupodam.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c354ff1a38---63645427901.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072906a37485---37706022685.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/newilowis.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c916fe69b234364c7f91480ba867c522/29415609976.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1f0f00f7d49fc1128bdb4c6fecfe5f21/lezazasejur.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/3513208994.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m6brv9kb7hg52ccuav8s1r4ke2/lamavivimugixupave.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3408537f---37892716316.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/bugirojavejawofatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+gardenscapes+unlimited+starsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011fd7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FD7 16456 bytes
SHA-256: ce0b8917e9ee8200fa931d4106dfb223b05ea3e79c1ef1d4259a40bcd0647ebe
font_00_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 25644 bytes
SHA-256: 3e05aa4851b6535c6ee0202ddda83dffd3697881908f5d0b80e5ae25fce33f1c
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 11044 bytes
SHA-256: c7c0a326a0a815768813e5f4b1a97a5c618c486d7dbc6130a6d421c68e54801f
font_03_sfnt_off00014feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEB 2956 bytes
SHA-256: b282a29e35e6a037b68c02bcc1ab9f08593e55df4d85bef44ce37ea584dfd819
font_04_sfnt_off00015c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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