Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8fec21b5f5f4c6…

MALICIOUS

PDF

93.9 KB Created: 2021-08-23 17:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02896e82fc1186c0c89361f08fbd9aff SHA-1: 504f0de3ec9436896db4500d5613b81bcaec816d SHA-256: ac8fec21b5f5f4c6053ff51c565f558450e4e73627b3929c4e4cc6ca1b9c8445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple links on compromised CMS upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://carparts-fixture.com/file/file/94997161514.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611767ceabdc7---lebuxujixopa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/69175534276.pdfIn PDF document text
    • http://dalaichau.com/files/kolelakefisofudum.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/separedij.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/34170082062.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/58154008117.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7b8df2d---10991204103.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a2e1cf04adf5035057b4e423a89efb84/jajiwizabekutimik.pdfIn PDF document text
    • http://quaint-house.com/gofixabirovipetodora.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/88165736886.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e573c4a---rasalesajurobulajadu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/046d682a838bc35646c7116fb33d1451/53298437754.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97d0676ef---97681210734.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087acee92ce3---pepukuxuxenejowo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05b4d9a18---zuneme.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a4673007c---ketewuzedawikapa.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/5057925917.pdfIn PDF document text
    • http://talleresjpg.es/img/file/3093219533.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/paparajufoderuves.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096455a9d4e0---guzigotujopezo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38b71c1b7---23008047803.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/54808350418.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/95731970179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=socialism+us+history+definitionPDF 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_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 17972 bytes
SHA-256: 08a23c920c39b3f2869917c72345d26520aeae114a4d86eaf13a52a8def4ae99
font_01_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 11028 bytes
SHA-256: 4e05a3621d8a6e9b9923858e3e432b2a4d7541bf5a706ad1bdd7e17be85e004d
font_02_sfnt_off00015108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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