Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a5409c740e5fc7…

MALICIOUS

PDF

94.8 KB Created: 2021-09-16 16:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5249a75008594b390a1544bab40c8fa3 SHA-1: f8e24a41cdba2d4eeb53507e8446b51d7b19da29 SHA-256: 32a5409c740e5fc74caeaf270e2f81eeda090649a3f003f6ceedb54dfd19191a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these sites are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=pokemon+heartgold+and+soulsilver+rom PDF link annotation
    • http://newcityhk.com/userfiles/pisebapuxarigelirux.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/vabirulinipituroxuni.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/88267918061.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/24927825193.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/tanoxajobosojema.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141397512cdb---17730221323.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/merarijapemaxeti.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfedb2b618---66705552833.pdfIn PDF document text
    • http://special-pharma.com/upload/files/19142624320.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e3d5bfb79b2775f0a21dcc6907fa56d8/mubama.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/vonolinekut.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9498c2993---1407901855.pdfIn PDF document text
    • http://wwsm-us.com/files/file/34932688859.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/6226023544.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffafed29f---78445895414.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/44930430718.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/85269990615.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/52583530768.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/53945042918.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/17170048747.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/32354787016.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/ravetowebiruluvu.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/71910249722.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xulewomidibaragir.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/jifivoweputu.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/79070931494.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51454170644.pdfIn PDF document text
    • 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_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10952 bytes
SHA-256: 3921b1df0c616e74805b28cf7757282f70626212a775789110ff744439b678ef
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 19300 bytes
SHA-256: f0de7001bef223eedc187cc6aa402cffd3fa53063921e4a0668dd8cd09e44e9a
font_02_sfnt_off000154f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1