Malicious PDF — malware analysis report

Static analysis result for SHA-256 268ae4fb12e76eb4…

MALICIOUS

PDF

78.3 KB Created: 2021-07-22 03:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c40f6d5726a08fc2874728877ff23469 SHA-1: 7e1b525f160edabf3712f6546236b982590aa185 SHA-256: 268ae4fb12e76eb4ff8845d1ff9e54c29e9af10c21d13f0b334466c9c7e94b98
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/98622478a01a3d79e24b0e8c827f0fe4/70199353947.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/79706984748.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/22250871678.pdfIn PDF document text
    • http://sowitech.vn/upload/files/98629250221.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/abe0bd058fa31d8c982768531b786e5b/92959527137.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef805f1a39---jakibavuxitobeviwovomed.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9hn98ihi1euoh34n0qnosuviir/38478674410.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/21361296268.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e160d3a1481af6566de0aa3f7d74d932/73735528854.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b72fb0f8b745df7d32d394c66856f2d/nimulagijozonex.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/pefaragasim.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tabogugi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d89a46c8---46087039971.pdfIn PDF document text
    • http://effektfilm.de/files/file/13723626221.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/pevefixozigo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c097b6b8---63600571118.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/bawativapijupikuna.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/25633493689.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c866ae8a33d---dosodosedusamegixokewak.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/buzodaduwiberovunot.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c182b5ede4f---moxejixilisugewenovis.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/ziraves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=responsive+grid+systemPDF 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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 10752 bytes
SHA-256: 8a41c55750f86b99ae57657351387d21fb83b84d61485c6d5f1014c912362182
font_02_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 16712 bytes
SHA-256: 666c1bc8c930fb62f56fa634026fc4843cce8696fbcab77cabe12415adfe6a25

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