Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1607732b60859ef…

MALICIOUS

PDF

76.0 KB Created: 2021-07-06 09:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f088dc9d4ad9cf97d0bcee0fdc9335bc SHA-1: 604a7fe7c2af0305f01fa48bdd812a9c8aeb8e70 SHA-256: f1607732b60859ef065f31bf9f56e95e95cacb04950ec4bc0708b90a9d7dc0f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8afc9f57---birinadotit.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9p105o9c1vngtjt082qdajf720/dugasaka.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/warawaxugoribuzunu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n47jb8pqnk2r3o21qlcoit4pg6/kepaf.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2533cd28---29745277259.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/g946uomamdcdkfni1hlc8dbeuk/xuguloguluzovafi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a9dbe4f739aaed8b4d76ee1965da9d7f/70670573669.pdf
    • http://xinyuemu.net/assets/202107/files/20210704062120791426.pdf
    • https://rkdestate.com/userfiles/file/65791883201.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bca35063---wobobapafi.pdf
    • http://test888.org/uploads/productsfiles/20210706052127_e308a.pdf
    • http://ankurgroups.com/userfiles/file/fumadox.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/32oe1ahpdvcu96224fbsc53j18/keliludevititodisugodener.pdf
    • https://waroproject.com/file/togomapobuzapezogogezif.pdf
    • https://nasselgrundet.se/anvandarbilder/156/files/57178949256.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/41873314903.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26af63597c---gedobedege.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3go3a1aue4dca0f5necdn3t7lj/sixolig.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/5073376776.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f92e524a7---mofapo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792a17eb6e2---bobuzaba.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d58eb8bbb84427b5909e7ddda4d49c72/57094218998.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39e264d5a---82939841657.pdf
    • http://focostrade.com/files/20210614064645.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=to+get+laid+meaning
    • 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_off0000c656.bin
9deb29644c0ac16c8931e399f4ec842b84641e32aaaec87d5919934540130e12
pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 10284 bytes
font_01_sfnt_off0000dd39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
font_02_sfnt_off0000f54b.bin
29245ca2aba9bc7e77af57b4f271d377bc06eb514380d277ed1eafaa23291d79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17432 bytes