Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a4bf1e7942be5c…

MALICIOUS

PDF

143.4 KB Created: 2021-07-17 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8073de5e4f90ea2b548303559ca05909 SHA-1: f671842a633efc0df62c533a51d6f4a42dbb294c SHA-256: 50a4bf1e7942be5c2de1e4a621a0bd6365a161dae96313c3c3d8e698e707cd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47783487377.pdf
    • https://chris-arnold.com/userfiles/file/paxusexizivasidivip.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffac3f04c---lononobiw.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/627f3450a958a4d921fd2f5fdade2783/tuwujojan.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a5cuedaju3unt4gch0fv4kn1l7/jegijalis.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/n475klvlgot21hdmvici8p4t0o/jojadakagiwida.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846a78df22---pedoruwexojobim.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1276a0bb44---26762684078.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfc9b2848---36084684163.pdf
    • http://onlineexpert.in/userfiles/file/16566453999.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/75221758138.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160733db2d9763---56684878451.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/64279979806.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdf
    • https://mk-sito.it/uploads/file/nodezeribagazafaf.pdf
    • http://slsnn.ru/content/file/mexokarexekobagabusazanex.pdf
    • http://aceonlinementors.com/userfiles/file/16704650507.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba016dc35dd---99662198559.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/odfhj06hovl6chpqdfir0bq4se/babibagunu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfd2c1b158---wajinipatepafupinoride.pdf
    • http://sosnovgeo.ru/userfiles/file/15980065921.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5294139255eabf28d860ae58006267cc/33299256387.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01280b8f1---lokubujuderuwogenusa.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/34771951546.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inner+thigh+muscle+cramp
    • 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_off0001ce0f.bin
27225ec64cd76c12bee826b23303331e051aebbe426c7219037f3f98b0e4ecc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE0F 10752 bytes
font_01_sfnt_off0001e696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E696 16792 bytes
font_02_sfnt_off0001fea8.bin
8fcfc9cba518575b1709326536d3a18f5fb3041be9a2bae6523007097f5c4f66
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEA8 18952 bytes