Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ee7eacf1cb9319…

MALICIOUS

PDF

80.5 KB Created: 2021-07-09 10:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4588b0c9de658bad5e7f52e91cecb9d SHA-1: 5485ca87004a5a87a580a0b3962d50ede9b43c6f SHA-256: 92ee7eacf1cb9319cad17b3c60c22579069c15120c3822c1a4d8864d3de7ec9f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://alexlunacoach.com/img/editor/file/sefexapepe.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/t39vu146p1t8lvh2letk17udd6/sipuwiliniwuni.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b8d788ae24d731fb437f2f5ad6af2959/kosonarozekeduparinu.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5ee1ccde7skg52k4gr48mbms6/kogudepasirujudulokul.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20c0d3d0795fb26f0f2afb5b57ffa9f/bubuwevogasuvexewo.pdf
    • http://aapltd.net/userfiles/file/feroj.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce27951904---talifenogilabowure.pdf
    • http://fresh-j.info/images/uploadedimages/file/83254726509.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6953fb6a7e---wetojobijerekodamufizefid.pdf
    • https://kham.vn/userfiles/file/29585078795.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d40eebdf42b---23352277084.pdf
    • http://boathousebrokerage.com/userfiles/file/65064370384.pdf
    • http://billsky.ee/files/file/28343594338.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a92996e0c26---moxukubeguzusoferepopaxu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5912a5a7e8---11920358443.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/favunopatulaxegunepur.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/80282c9034292c7e2814d243ece5cb7e/45200759200.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a06d1461adc38963896b8b6f5c4d063d/50148051350.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0dc9982c---luwosepatitakidopof.pdf
    • https://muzeumkonstancina.pl/attachments/file/16031414897.pdf
    • http://movementlab.dk/userfiles/file/difagogimemetaroku.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609585365a0f4---60386392201.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quadratic+equation+extracting+the+roots
    • 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_off0000d684.bin
d299c974bf38334649bfa4bf583409042db009a0b48c9f0cf50356d467d439d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 17140 bytes
font_01_sfnt_off00010398.bin
24242ef15266702f4c92996a6e59c3686668e0d33ae0c0e636ecdb2674e360b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 11012 bytes
font_02_sfnt_off00011cbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes