Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc134802daf97f57…

MALICIOUS

PDF

171.6 KB Created: 2021-07-02 11:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97a45cd2c2a73d35f39281266f28dcc4 SHA-1: 4054d15777e64ab55eec691c770e767fb6b48155 SHA-256: bc134802daf97f57764c2384986f46cba1c248dd7c5a6229b746aabf7135b116
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

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://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e6ce577239ad2c69f279410d48b62e09/jalimefesufetu.pdf
    • http://icsbc.ru/fuploader//file/xugaratow.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9f1940c4441ceee1406b1ea88f54bcd9/peluwemevepotujixolarew.pdf
    • http://madang.eu/f_pds/fck/file/90140225465.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a17a22e3a92b81b9a9cda4814f630195/53634638249.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d433c47f389---furunerelanu.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe4e2b100---35943459773.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881c7a88dc2---42875183199.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/24cc69c19f4476a05fbe1eca7c0ac986/91285649819.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de789c4b0---zalafesuri.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f341b101d5---78275626934.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/35157cd2ec0bab0781595d1c54578d87/fitosokomuvawagasex.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cd73bdb9---66926730399.pdf
    • http://dok-vo.ru/userfiles/file/kufatu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5eb400225---7986630759.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3d3b4031bdff337eedf884e4274e1726/guvedelomenageladarovebo.pdf
    • http://rococosofa.com/files/files/nasusomudarini.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/madp2vnnlpcpvbf618i9qifes4/gususivinaj.pdf
    • https://cleaner.pl/userfiles/file/65979500673.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/68d9912d9a5ab0886fa9c107ac049780/88910898181.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900974af7a5---28122702256.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e3937858---47307150677.pdf
    • https://lapalettedesarts.fr/gestion/file/kotugavizimimewufejibiv.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665fbc80f1---53899901264.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b2436518---95174573732.pdf
    • https://tecnibat.net/uploads/archivos/vepivefi.pdf
    • http://christopherdallo.com/file/zakapopuvovulo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=name+and+describe+the+three+subatomic+particles
    • 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_off00023982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23982 16792 bytes
font_01_sfnt_off00025194.bin
3df140b77f53aa9bebb9f14fea3029168a294d3f2f45108a1be0775174bab11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25194 20304 bytes
font_02_sfnt_off0002873e.bin
4bfe1c6023eae338a518e44fc7952ed28ef762cd2c715d76946dc430af7a8fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2873E 10996 bytes

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