Malicious PDF — malware analysis report

Static analysis result for SHA-256 422c4d57141aaf55…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 08:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03102ed423c0725116d4209136ec9ee2 SHA-1: 769be75139b5cdd750aab26be5e6082e40646590 SHA-256: 422c4d57141aaf55afc793b619fe3e31e4e54f5833a38c631c80f1ecf42eca5c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external, potentially malicious, content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://geneolock.com/locktactyuma/userfiles/file/fimobogofajura.pdf In PDF document text
    • http://kibbkw.com/uploads/file/nasawosofujoxaleridezinu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/55946777239.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://jaqalsports.com/files/file/87616867878.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7p110i5uu4triksg5pvb7affj2/68323594050.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a4f29db813886fbab803913a357ce3fd/7850875304.pdfIn PDF document text
    • http://ashioke.com/images/library/File/7535372327.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/38865542389.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a49daeeb1d17686103bfbefd56add213/38480978494.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0iaf85qm3ucds162m2bq9p7eo7/53947317699.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0e817cc853e44d52fe80322a918b3229/lotiwoburabevixezuw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90f77bfe5f---68973840108.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/86646799855.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gukafidirotuw.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/19073623587.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/k4hh73qi660fuvlqk8h8385885/87542694283.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfafa95d64---93724142452.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kdn5g9g2sks00p7i5vl66gb4ro/rozijelibebuxokisebos.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/73281185228.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wasopodux.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kafazofapexogeba.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/lifedanekaniwive.pdfIn PDF document text
    • http://kbchina.de/upload/duzajaluxugaxo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/353fcb4a00c3fc86cf79532d8ca8c793/moxofafababadepipexuxov.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/329c095c2627ca686deeccfe5bf1ecab/kodobus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=taylor+hobson+surtronic+3+manualPDF 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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 10852 bytes
SHA-256: ba73a13264aff9bad79f1f6b06bcb8763df3ce97a17af813534000e72f9234be
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 20288 bytes
SHA-256: 2aa15c16acffcfc12e96a9642d8620802c73b436b0429b1767e5ee210e8ba14c
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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