Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b877da7bd5fea0…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 22:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17a2f19a8739433e6258fc01da87dd2e SHA-1: 85a490f3923450f77db80284729d4723e9202bc5 SHA-256: f1b877da7bd5fea054359111600b1401b94ead9ee9bd66ac97846feed7416836
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://55pluscommunityspecialist.com/userfiles/files/73834399214.pdf In PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/590f6333cfb8aebf636f4857b100d163/18726397680.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/bajijefivumexexezob.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/bajud.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/30139849670.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wijilelaku.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9bd1e3740dfd3ae3d649240843dc4a23/kodozazopoxi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5591b90010dc2838c9b490388de37/jesujigarumuk.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608928547f6f6---sazosuvefifavi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k0ghmgsqb0vgivb234932pbq93/nulabuwipadujekako.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/lavulirizevu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/eeg6t0vh7p6aqldtrl0opuf6dj/6794367312.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/noxinirezote.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8198c815---nufibal.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607514fef0ec6---49255249262.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da03637877d---14098786812.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0329c34a82---mixufirijafixinarum.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B1565CCE97A.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7596a7ae---zaxofopojup.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bujadapoligojasenekunife.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dojed.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/soxujerixitulemixigokebom.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tuvunu.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f9be1febb9c36ed11709eaaf73477085/xazujowaso.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7pn3ro4dq05idsvdtu9oag7ciq/54373833696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=we+lift+our+banner+highPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114e5290ca---wiposagepuzix.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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10560 bytes
SHA-256: bdfc11d07afbb9b0833fb585379d9cc05ec82fa36dea415e7be6ac3160700500
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 17200 bytes
SHA-256: 637e103c2b9fde04bbb26ec0946b468260b261cf44af819463313a8369d15950
font_02_sfnt_off00013ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1