Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea1125eb37c9067…

MALICIOUS

PDF

92.3 KB Created: 2021-06-27 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8c8ef4f8fed4f040c758acfdc66287b SHA-1: 949a1cefa25157b758df343477e7c5c5b33adbad SHA-256: 6ea1125eb37c90678095c5c1c6419cd221882802c08b4d168396639aa396cfc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and other disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=discord%2B%2B+android+apk
    • https://topjobsnepal.com/ckfinder/userfiles/files/98161754417.pdf
    • http://www.urbanwaterways.info/files/rokipuxolagamamadisapuzik.pdf
    • http://tms-operation.com/upload/files/runemirub.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/96ca53817664cea357d284a84b94bc3b/betixeboveram.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/da3d3d6edb2b2f0281a89903d28d8b2f/78499109605.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vs65ll5p52vv37hacna7jpb806/tejakezatojujod.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0fc9cf8557d80db7b68381eb38fa3ac8/83438383850.pdf
    • http://ecohost.ru/pics/images/file/62246624859.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9iqga26krniau2qr77vvvn06u/49950221569.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083078a95873---mijejapa.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8a82rr69efjmie2d481m5pefur/mabifogagizirodow.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/78a9c67db28766d1b079044e75c05409/15606548098.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc6284f48---49065692627.pdf
    • http://yulintimber.cn/d/files/46897663479.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba8d6099---25977460348.pdf
    • http://westernmaki.com/uploads/files/67382692253.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210625211454.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73be2e186.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60b7a8a79---tutefinamidigixudekufari.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079596069490---mopizadavuvatedenivol.pdf
    • https://zabulgaria.org/userfiles/file/7154350225.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6fe184f5ea18ca12172a534526e61d00/xagilarewivinek.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/27ce4f81bc8f36878e9d9a72bacc8a30/69279349199.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03344a8318---72422394627.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f1.bin
1821ac4b7d6de457ad1eaa96fee43f9142b060b78c51d8344ffe3bf32756baad
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 17004 bytes
font_01_sfnt_off000134c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 16792 bytes
font_02_sfnt_off00014cd8.bin
0e25594ba7957dec2f46ad671c1ef147b36d14195524edac514be0917645e5f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD8 10324 bytes