Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b235af85ffa392…

MALICIOUS

PDF

83.3 KB Created: 2021-10-11 02:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0ab7c67c45eed8dd113ac6585af8b23 SHA-1: d7f8d3fd48bf08f22142111a06e21abf984b1490 SHA-256: 34b235af85ffa392358f7e9485af4f503fafdd39eb4b6a75050bb39c855c4a57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=list+of+connotations PDF link annotation
    • https://candbco.com/ckfinder/userfiles/files/94712510058.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/334689895.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1f03e2ab5c580e6de7d789caec420de9/73690521213.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/24469159556.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/59957262869.pdfIn PDF document text
    • https://renewone.de/files/naluwomapodusefirevop.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipadirenewamatopuloravix.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/lenupapa.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/jasewigovefi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/44740855749.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/gofovujulagarazusavo.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109260159436803.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/50919956329.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156918f8679f---55676265031.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/46082697688.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/949efc53291777b236b57c583f6446ae/kogogutatireresi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece7308dc3---37258597487.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/xazif.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/13456437392.pdfIn PDF document text
    • http://orderkai.com/uploads/files/87630971669.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/bujukuberifoloferero.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910043044.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/75249607852.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/rejonebexab.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/kikadibijuf.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17604 bytes
SHA-256: fdc50b894002868ea85e26705a2e6b1c1527afaf72cbb174d9f8a9896e4a79d2
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10008 bytes
SHA-256: f5243cfb32a284ae7b17cd60ff97a8fe5f0693e6148d64ee7d55e07e348baa7c
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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