Malicious PDF — malware analysis report

Static analysis result for SHA-256 58655a84b6937111…

MALICIOUS

PDF

106.6 KB Created: 2021-07-01 19:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3bee8cc8332531902fc670ed9b274ec SHA-1: d5607a655848a80e73924eb13bef947e31cf0786 SHA-256: 58655a84b6937111f18bf72dbd042de9a12702efe7381da83a39a34a699b0fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a common tactic of using documents as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=consolidated+cash+flow+statement+questions+answers
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ff8466a7---zerosakorovevofutom.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/fujipupipulixuxeve.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/97ea0fcc38587afb9efae0741f2f591c/82886844344.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c392d46c58c---zumerevor.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rolesorofigisefapovofo.pdf
    • https://aduanaldelvalle.mx/userfiles/file/kodemaboka.pdf
    • http://elitvorota.ru/f/file/27706821891.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cfaf554f9072781244eadc3d46e01384/67409338937.pdf
    • http://uctodane.cz/UserFiles/File/sumuvasukirow.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160983e1888a41---xevajobiledejajugo.pdf
    • http://growlink.biz/userfiles/file/nijazebirokok.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a9a404c11d55379741c977114af199c/kekurodokenubezejibara.pdf
    • https://pharmnet.cz/ckfiles/files/files/50534126760.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c36bb4c36---86775913670.pdf
    • http://laureysnv.be/uploads/files/6352742985.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086463ca1d66---wavuxigemefetuwibofesu.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a918mp5j8d9dun6mlqnialv1sn/97662243670.pdf
    • http://usmleworkout.com/files/file/gefurotofuvomevazikirok.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160362f372---rederipokesufezisojojuzur.pdf
    • http://martom24.pl/martom/userfiles/file/somosil.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd241fa5c---10187216483.pdf
    • https://hanyauntuktesting.com/contents//files/wufasosate.pdf
    • 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_off00013971.bin
3a56faf3c438771bf11def6bb170946294064848d983aa311fb289d837adf6b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 11104 bytes
font_01_sfnt_off000152f7.bin
d7dfae396d8dd77088b9bfd1775873e02fa19e77d8818133675594e6f53549df
pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 18808 bytes
font_02_sfnt_off000184b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x184B7 16792 bytes