Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f6c5df44d34310…

MALICIOUS

PDF

83.8 KB Created: 2021-08-18 12:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 819be01b40b746e2ed97bcfdfb476e0a SHA-1: a4f5615cb34ea22d154c5018e7065e831581fe02 SHA-256: e6f6c5df44d34310e8554c42a3d9fd12ca0025579ced11ae716c9ce0605a52cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not provide direct executable content but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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 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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2931489ef7eba4a1c4365979e6a71e63/vusabigikoriluwimevo.pdf In PDF document text
    • http://lt101shop.com/userfiles/files/gomatobixijuzegabagivipuv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c908343f---zaxenabugid.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/5735057386.pdfIn PDF document text
    • http://mfahk.com/upload/files/zenarovoxol.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/jologufulelazumel.pdfIn PDF document text
    • http://sns.hu/_user/file/lodutoxalipu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610cccaccf281---jokarikijo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0884656423---41221308410.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ec9c70677d1e945fddb537b85a7f666f/8129103417.pdfIn PDF document text
    • http://standdominica.org/files/files/gapaj.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/suwujevonizowuwikilijumul.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/94858397752.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f1a7d33a4067bf55f4bdd6c7f412400f/35192808273.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/597e20a5f0c6823dec74e1a56eb7c363/kenadorusejan.pdfIn PDF document text
    • https://rotitelor.com/contents//files/sasumajemaz.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/1293606737.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbjfr1gdbqmh24dbaagfql2sb6/diwifekivurivajapufiru.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/nozuvarori.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/pojizedule.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/89897812610.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/02d9a93bac9687306fd47369b9df14ff/paxosidolusodej.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/41917250180.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/mutasumipupetuwovajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=protect+specific+cells+in+excel+sheetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 18036 bytes
SHA-256: b9374b39387c1e5f0770b1d4ee04ed40800413b8d01aa964ddea0c636dd58e71
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10520 bytes
SHA-256: e9538c400b450708f4b66022e751f1264a484d10f5a1f474143e668f27828541