Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8831d63332c614…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 04:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 920376a270d2dd9c4fdd5f099a91f898 SHA-1: 45fada26ffd6b5356677000dd32a55e696736a11 SHA-256: bc8831d63332c614487e6c1a04bd0447d6cb13d64b72d08121cb2d4a76c25fad
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document's structure suggests it's designed to lure users into clicking these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7269798e83---44895563631.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e1b24c4---rujad.pdf
    • http://angelescare.com/userfiles/file/puwimejibada.pdf
    • http://amandamaitland.com/images/file/gusumobezelub.pdf
    • http://appletechsolutions.com/userfiles/file/sivimimozeda.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/98615d73fed5d940f9b300d24fdd8706/39434077576.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d327cb0596---15037123002.pdf
    • https://glbtrader.com/userfiles/file/xumobekozebatusajojerevas.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca1d5fdeb---xuxigomovejam.pdf
    • https://ptogel2.com/contents//files/63785443655.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160790e19e7db4---kawataguw.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/27893f5c5fbb46b2a040ee680197df02/71386063552.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852a556321e---86963153028.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/tasabazuvegopu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5332c6ff---76868776734.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/b76l4tvh0shqb9dtqsf3g839mg/takufojevapazeke.pdf
    • http://rajskiewakacje.pl/userfiles/file/73222768102.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8703632cfa---viwovepo.pdf
    • http://lnaixi.com/userfiles/file/20210621112709_35522800.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607213739a4f8---pimosoxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=career+yes+or+no+tarot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010194.bin
d139ade1971335d46dd567e030b3e0f01d8e9ca457446dfa91a1c371ca57f770
pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 17520 bytes
font_01_sfnt_off00012f43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16792 bytes
font_02_sfnt_off0001475a.bin
d5c446419cf7eebeb2f700ea7cf893ccde685dfa868bf19871dab38d03861b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 10108 bytes