Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ce13b26ecda969…

MALICIOUS

PDF

104.7 KB Created: 2021-09-05 01:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40c2b2383b2992249c3ff784cfc838c3 SHA-1: 0eb5872be287beb74edd94c2ef983e04079270c2 SHA-256: b9ce13b26ecda969ae2e587426c1ce6f49db54fbd98a455ef4180923fabbccf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=jurnal+askep+sirosis+hepatis+pdf PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/kiraberejot.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de2ca7bce---40981432316.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9602298e2---letiwodurem.pdfIn PDF document text
    • http://vit-physio.de/file/15811685440.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/xasifujedesibedomojaw.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/wavukogetefugotovizivi.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/namidoraxazalox.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/84491913056.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e147e5dd14---mijowaxasijunugoxupujiz.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/dupufovuvekafesedeb.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/79471588192.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a19af0c1b4b---72878974737.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80567417b9---tafusexavojifog.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/37365582367.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01a908bd6---29027784300.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/lugujopotajirofe.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f8489e7d0d7ba32d7aedd446e7910fc8/80983044031.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/giwixorosujizalivawam.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b818da0499376ad765ea4a3fc68fea73/tiziguligetudem.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/31190669104.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/95388330797.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f674271b1---47921433203.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_off00013428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3F 10780 bytes
SHA-256: 058181c6b135fdf76a573a29602bbe9f30d153dc9ac7f4340670d5117ec5f943
font_02_sfnt_off000164f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F9 18464 bytes
SHA-256: 33104e77813337237f4b38e18764fefb9aa0a09c84a2949845abf64c887eea36

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