Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a40586029664282…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 07:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d23caa4053380469568eb50198c7dd4 SHA-1: fb99d120ce502eda471b89d3fd569e061e68f1be SHA-256: 6a405860296642825039ce3cfb46d48bbe97bf5a30ca0ebbbcd2ef05f8513460
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these compromised sites. The document itself does not contain readable content, but its structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cd1388c555c1189bacccee070fa5d2ff/fineru.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9a578b97f---77798863461.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/kagutepusekudijusonogir.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/74855607142.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kipudorumef.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89931301787.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/85034874152.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7sr6kbq46qpkase4aef8i33n12/73884496696.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zitosug.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ab406f6edf8adeda291063eef3283482/54382053402.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/toxibekopetefimaziz.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/93322679668.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/valugigewuvexaxibilas.pdfIn PDF document text
    • https://songhong.info/userfiles/file/7016741986.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/59062881193.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/92343939598.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5mdjnr9mfterjro6u0hjj8r320/15553692319.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14031a818---xavijituni.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/60083554513.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/junugibezugozomukin.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/41352141299.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91359784929.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/12519237832.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/89772e07a70471bdb8592f333445c98d/30829236448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=java+podstawy+pdf+chomikujPDF 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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 16544 bytes
SHA-256: c4bd4df0b01d5ff9991e8e97359bc24bab6e940a9c91f21f17f0897c547340cd
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11084 bytes
SHA-256: aa67178a338b8d89e3607b85eb8b6b04f6bf4a4aeeb5b7950cf58e6eb6ada692

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