Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c66e988970b56e…

MALICIOUS

PDF

158.6 KB Created: 2021-09-07 05:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e99253a82d6ad1dcb6517b50000d16ce SHA-1: fb3c2cc28abaa0f8194b655e4ef872306ecbcc35 SHA-256: a8c66e988970b56e7bc10be582ba884c69ccf938b9ad7d490443815a1ffcbe1d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://philabc.ru/uplcv?utm_term=abbreviation+of+journals+pdf PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/71dub9la0e1nhtdrs9dr5qnha9/gaxuruvemokowaz.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/pogopodozikulagilup.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/99819699750.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a616f8b0---sajiredusosefotuxomuruki.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/46891334296.pdfIn PDF document text
    • https://avvocatoboretti.it/file/22085278878.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608556ac3fdc0---1124091097.pdfIn PDF document text
    • http://napiarsaigh.com/images/suxof.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4aa6625b6555cefc13cb42b25696a490/47922614095.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/22410771596.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f07364cf20c---21670736917.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a1e74afba64b7e2890e3ec9e277c4fc9/dexulufokapulajimeda.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/nugujesogixikimemux.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74918726656.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8ef94e0b---varobarowapokofomiw.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086804c2d3bd---11052929694.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/xiwizibepexaguzokozexo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/vazorotelimupabizope.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t8dv0ri1fef1drcqsniep3msjm/zituxasonuvibuzapojebol.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/forekuw.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612563941c780---xukimerejasoga.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c243d1522d4cc979125f69c3664eb558/dosetutedezutudifuni.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/58469648952.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/15479623567.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vadaxolulizejobim.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2036E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B85 10908 bytes
SHA-256: 5fe913952dd26cee534dd5e438e4b8e2d6f5e84059b625f51bb0913f1d8d042d
font_02_sfnt_off000234a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234A8 21840 bytes
SHA-256: 24f45da1623dd08e1fcc57324ad853da7874e562625678e7bb7efdfd0afcf48a

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