Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c402c635e902ffe…

MALICIOUS

PDF

178.8 KB Created: 2021-09-03 09:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2eaf28642f799fd979c70a53f54e4477 SHA-1: 4d1b53626d478e7251ac69cc24e2e44c94666db7 SHA-256: 9c402c635e902ffe92d9ee764962a3b27f40714801e82696f8e599ebe61a833c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=oracle+forms+12c+tutorial+for+beginners+pdf PDF link annotation
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wodomerivozezifejabikilo.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/90087394255.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/7cgov12osjoibgsoel02tih9f4/16064508467.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/21931093930.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57768337383.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rtlbefs940c9fopu4h85n3970e/19533719093.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c46e1cab---sesiwuj.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/jitujaxudufu.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/48056458033.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/82037909224.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tokibag.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/vokalogazizawafaka.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xumanadapebufudenina.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de1bbd73f50---68784522637.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/75090888306.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecad5a03b74---gusukeguginewuli.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/71925292889.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/baxewokek.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/36388362543.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/78152716375.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/1k492ei08sd44pcce62fjgh5qo/68847526577.pdfIn PDF document text
    • https://2acontractor.it/images/file/56124617897.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/berazotowolifufuvipajif.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000258d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258D4 11400 bytes
SHA-256: 1bdfdc5f4277374151817117f6b86c6799aa919b8806061c8fae5b568f48e772
font_01_sfnt_off0002736c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2736C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B7E 18640 bytes
SHA-256: c17e6bd0ea857edc81bbcec69439db366ea212a01d86de9ed1123fdc1a51f5c7

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