Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8829bc8904d180…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 15:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cdf7aba9142c0d676fa9c5076b50db1f SHA-1: f827b59a9e6a495c00bd56f7cb021ad3b2cdbf3f SHA-256: 0a8829bc8904d18087412b41cf6a961396a3d20fb1c57275fbf50a4312c7471a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to redirect users. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://magogaralbamoble.com/galeria/files/7830965769.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070016b0d4e0---tawola.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608154be47420---95443039778.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/99897274840.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/zutak.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a677134ce3d---tupuniki.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/xuxijijedupil.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xuvajuxafinulego.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ccjqm8apc2aundcs6506mbqarg/15590808076.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/31724008785.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2bdr1uuoq3jd6b0b0kmeinu724/53341134913.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/badatixexun.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o7cis3pu5cqspr5rhqdn822qu5/vunomuduzudaw.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/ropoli.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/48655765104.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa675ac7a29---81792794342.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3rd5b04lbk9a1ra6s9847uadq2/64713512293.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ac321b8c07a221c9078278cf26613c14/63886355014.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a704e9f9---9934811554.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cd0072e33c479f73f03753d3d7f2b94e/maxigibexidibesakix.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/69270621327.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jabulaxewadozabonap.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/64eb475e1bc674960918daa539805ddf/86406935695.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/bujakugotumapiv.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/97755247356.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/58668512780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=food+fussiness+meaningPDF 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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10532 bytes
SHA-256: 22e1f67010266d71e3162870294783efabe2f1c17349382ecd72a5d577bdc3c9
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16928 bytes
SHA-256: e5a651bd0dd37cd5fb4d647fc8c8210dd75e7e5fca3b17c9397757fee1eca092