Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b72adecf44a361…

MALICIOUS

PDF

113.6 KB Created: 2021-06-30 13:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ba26694a0481da469c2e51f17cbb87f SHA-1: cf945f843dc0a6622d8b572f2e62b41427c566a6 SHA-256: 79b72adecf44a361f975a7f9ce7c7903f046b3216bffc6592234a092c3520aef
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest a redirection mechanism to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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://garglob.ru/uplcv?utm_term=are+we+there+yet+full+episodes
    • https://alkalacarservice.com/public_html/userfiles/file/lanofemisifagis.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608820b4232ff---41868319332.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/43be31a7274cb4c27bbf7d68c58c9f14/15777301529.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/321b98a17c17fec26baf0888b43dc5ec/47389080825.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb64cd07f4---31438427891.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/51733372514.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1us9gtqa6hl0q0du2cb71l5ogm/fovuluxava.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a7d56061e---17705957217.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5a563b5a272242d2492a24ada23a0a85/bofij.pdf
    • https://ferado.vn/userfiles/file/92607909267.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j9rgiaeaqpfo8531lesu4iaor0/kunozusejidatijojukade.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/54330054155.pdf
    • http://www.aportecnica.com/imagenes/editor/file/sanokipasumavezotifigop.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d023fb1458---67853271047.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/31un5mt71eqak2esmga0i2ceuh/61934134676.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9cf6a14f626dc261efb3a2dc808e7c49/gobisepogosenuvuzi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8c8bf041b401bf6e6feac99af236f48c/94864765407.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c261c077---wezijejapeluxug.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ff01059f8935c6f682cf72be2b61b959/26302466128.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871d4ae8da---bufomowujolufabuwez.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126bb3bc94---zatapozubigesuju.pdf
    • http://champagne-marc-chauvet.com/images/files/78989376206.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf61d50f3fa---nadimi.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e285e600d53b98865571bbe72555404/japitilipenonizos.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000148fd.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148FD 18328 bytes
font_00_sfnt_off00012376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
font_01_sfnt_off00013b83.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 3464 bytes
font_03_sfnt_off0001669a.bin
339e0aa6fb43ef7968bca871f45293ac2bac47035796f8798bd7ac96daf7e1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1669A 23512 bytes
font_04_sfnt_off00019f93.bin
70c33f25c659807eede5141a458a9b52e45a4417f8851efd57579389cc7bf5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F93 10608 bytes

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