Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b85e620a4c4260…

MALICIOUS

PDF

117.8 KB Created: 2021-07-04 06:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ebadb8131793982436e7396ff07e9ae SHA-1: 2967338dbeff64e9f93a36c0b2d7623a30bbc86d SHA-256: c4b85e620a4c4260d8ab654a5b0e45437f1fa0e30630ab14482bd2755e25d600
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. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on compromised WordPress sites or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://crysiq.ru/uplcv?utm_term=paved+meaning+in+telugu PDF link annotation
    • http://clarasonic.com/upload/file/toveziwexusirebup.pdfIn PDF document text
    • http://slsnn.ru/content/file/buvilabosutaj.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2bc605e71---11226353624.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/susejavogefedidafax.pdfIn PDF document text
    • https://tipresentoio.it/images/file/fuzamifixif.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/befulixupij.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ccd34726---7366390186.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dee651d69---67691768045.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/93589934409.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/f56sk1hf959dkgvf49srdep6o5/jojoraxu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf5b49974---21057440209.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/96560457249.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734eed5613d---68725369670.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/3666589499.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/43da70f54b49f50334f74b1f8169fc44/gogarugakekemekusagiposo.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4h19bduhjkgdk5pbpsteoe5762/nafuvuno.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/94696963874.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093044584838---21618133517.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9ifelm2lfr6jo30rq2qv9tvt81/69040215057.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e920439efd---tuvedadememesok.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/wawibepojilem.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0d2501a5e---49116628432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7f01d8eb---sudujafani.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608235a81d861---ribojumasuzezegol.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607799312ea4d---mazasawisevebu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014ea1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EA1 25052 bytes
SHA-256: cd89c1b5645bfe52bf0bf3518fb712ee3734b8d485115013d32156c0d2814378
font_00_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCB 10372 bytes
SHA-256: 658af2c63ff0aa65d10fd66a32932c9d217e821e11b36450d130def65b170ee7
font_03_sfnt_off000193f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F1 20692 bytes
SHA-256: 7f72dce8fb6f26b1458f84f8cb02797efade4e78529b74fe070a5632eb513558

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