Malicious PDF — malware analysis report

Static analysis result for SHA-256 c670d6f5afc89de5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 84652491316b8836f7a321bd1897b3e2 SHA-1: 99afef1866ee795efe2f1a1dcbea0638666fe456 SHA-256: c670d6f5afc89de58a1d3a16b75d70625a92c8f1e56e202ec2b689babce1d68a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vaynhe.com/upload/files/42028506113.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/33310d44967d12d7dd9d3bbd4f8d1bef/20542146486.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609293fbe9847---80085299936.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/7974290515.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/bapadenepisiriboketek.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30743943145.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/segoxo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/17772307537.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/18250031191.pdfIn PDF document text
    • https://stopserv.ru/files/file/bidizexilagakopema.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610069b685c18---69195239380.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/241223a4a17e2d318f8446bde0bf8042/54648599536.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf01704aab---xetunukiguveliz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098295e5d17a---zirose.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/fokebox.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd6543800---79677282137.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbedb9898---tabex.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d19c2899e0dd13ff1b010e7abef5dd31/52019857332.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/93604325420.pdfIn PDF document text
    • https://mahae.hu/files/files/fusosumibojolumidijola.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fins99m3tonr766qeeldu7qfi4/68180673000.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/g0h64qfir5j44u8mqrnl5bmj7j/bizaxugedupasorovixi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f9fe6987bd4fa0fe97d03078a469ed7f/64849293164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hpi+baja+q32+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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 17636 bytes
SHA-256: 02df890ead57cf32d0308593e37b811f390bb38307bb1fc5dc14ae7bb1640f17
font_01_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 10592 bytes
SHA-256: d378f89428c0cdae5660f40aedbb2bcccc7a33f89eb0177558cb4a3a225fcd44

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