Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93dd16a4a83ac8c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec91ea001caf2ecff63d394b7228c63 SHA-1: 3835bd11d865a4920f0e078e58088a0efa0f2b16 SHA-256: b93dd16a4a83ac8c50481eb006250c69f2f0755c68c2c3bed3d7b077ee49ff41
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'SE_QR_LURE' indicate the document likely attempts to trick users into visiting these sites, potentially for phishing or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=letter+of+complaint+samples+pdf PDF link annotation
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/32254901604.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1f29215011b88ffab7443c2295407d85/86584707043.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee421e9ed9---62440036692.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a2f8c68d---17112095422.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vuvekenonivenumaginaz.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/nufonasunuxodukosud.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8a318b16176e785985e2cc90142132a6/11232258846.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/93994036616.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfebc1dd34---jiferegitojubaloleg.pdfIn PDF document text
    • https://chineseclothingonline.com/File/ruvebim.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/birevomiluzabebotivuw.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/tupapofiz.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7m4mt1asm7bvf1adhta3i64e8k/vatedagipo.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/36112684314.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dewuxunonij.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/dumabukejanew.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16438294761.pdfIn PDF document text
    • https://fivetc.net/uploads/files/namar.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f4548c1386a2f7bb9e4353f8227ec772/23748217059.pdfIn PDF document text
    • http://attlas.center/userfiles/file/koxigi.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/pifejokifumizutojosazeguj.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/47657551905.pdfIn PDF document text
    • http://vlajamo.cz/images/file/kokokiwisuwepenalajikux.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_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 10736 bytes
SHA-256: 258d00efd4a7d0de21321ef49130330a103667140888fb0cdaabff9889c31e9a
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 17932 bytes
SHA-256: 0692d065267424589baccb3d5ced1f5168a449569b2abc75fc0fec6396412491

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