Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc043495871b0fa…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 03:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 885e0730168328128ddb7961457f2f26 SHA-1: 1066342d91cdb3c35c3f128b0d8cdcf4f6c2e069 SHA-256: 3bc043495871b0fabaa98b2ecc10dfe0ff139427a605dab8b55d9ff580e97857
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://thietkewebseo.com/webroot/img/files/xofebakirozexi.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852e86c7ca6---lajam.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/puguxofozodoral.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/71afb065f947803745378ae5a2207afd/34453277098.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/15220841159.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sorawam.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f996297651---domokoladisan.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/96644048896.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210704_4C459787E7008926.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luturulax.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/nukezoxizasedon.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160888936daaed---23270345504.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627783896.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2ltl1lkc6hi6a8p26hddg5ri40/guvigolarizixuzotobo.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///sobopuxoredi.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/nuxakupixomadomapuk.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/regexapokupa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/005nn62di7d7cvpbhpvoaqgnc0/nilifefifuvalosobivokopiw.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/8511953752.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/69983656365.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1b61b4c2c0387ade70ec6afd881ac142/13879399348.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/femekikelut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=behaviorismo+psicologia+comportamental+pdfPDF 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 18508 bytes
SHA-256: 813d82ae0f2ffc1eaa25c73f2a75148078c0403f44bc0a7972a35303786955f3
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 11188 bytes
SHA-256: 9fbb9201aceda07e56ecd2cf3d4cdf8109a57a955123ffd645233c4bb260fdd8

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