Malicious PDF — malware analysis report

Static analysis result for SHA-256 961bb72785273e0b…

MALICIOUS

PDF

70.9 KB Created: 2021-06-23 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 99ed51cefdb4c91e69ab08828b553c6e SHA-1: fab554133ad7b3e4eb5a8184d61602b8025e6467 SHA-256: 961bb72785273e0b4a7dccf00cfaef03f7c664c658d36b7b152b07cae6fd5d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though obfuscated, contains text related to 'exam answers', suggesting a lure. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, likely serving as part of a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=is+700+nims+final+exam+answers PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b3bd307b---lutaloxijatadef.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8ae450fcf7e26a7570a72c1f27f2dc46/lakunijitiwezizokenenoje.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/sovumuxu.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/ronapabababogegi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/39724403889.pdfIn PDF document text
    • http://sport-way.ru/img/file/vojon.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2334bf78c---kigebekuve.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074721acbfef---51688020234.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/19410653fe471b32ee41f3ff2d142478/buriwobadusinakafupidotuk.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e7a4adaaf4fc430f335329ffe9817aa4/27358763456.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/08404050a5daca014403f6a2b6352ac0/23380647472.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/58df0a6c2e796deb72d835901332cfc4/53083263099.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d4debf74adf4bb5b091b3d11dc0c8695/kadiduxovodaralelol.pdfIn PDF document text
    • http://goref.ru/files/file/telomesewi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e48d68fd8---budiputag.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50442a3af7---87263351384.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/musupewaxi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e493caaa6a704f6ada202596e7bd6ab4/46209333841.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511175709021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 5232 bytes
SHA-256: 8b994b8e29aa47b1b4d501cb141f3f84c3db063692c03a67a6ddbc272df95196
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10124 bytes
SHA-256: 8d51827d23fb29352295e648514d92bd916c529c9a822baddee176ecf5380f6d

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