Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1d2745b13f2e9…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76bc994885e01681b367312b20e5bf4f SHA-1: a9a4a02cec1087ddb79538346b4c2c9273d998fa SHA-256: c7a1d2745b13f2e96b3f7aca26adcad94382f91d224f1dd1f0a8e51245497401
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple links to compromised CMS upload storage indicates a sophisticated distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mimpishio2.net/contents//files/mamisiranuxizetal.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/95377154610.pdf
    • http://limuzine.md/userfiles/file/sisak.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c27eb4af---98931556381.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/baca262eb55575aff9e99d0ca5fa55eb/80675010103.pdf
    • http://robwalker.net/fckupload/file/38868866471.pdf
    • http://www.kickcommerce.com/userfiles/file/kemijoko.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c6e43b030934f52d08e12a5daa599c1a/nekoruxagigunujusedelufus.pdf
    • https://atamergranit.com/userfiles/file/wujawudomasilavenenome.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/blknjfq2g4r0h2v02ibki0bpak/kebimuxuris.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c578169a27a---xateli.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c024ae5bb2b---98782109666.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f14ed9bf6f3546e4673f8ea6b576e903/90836362050.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/41e35f4710bb8123d3256918442713cb/1089731736.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9395c18132fb4a67a5e3ef6968ab9d84/60838230381.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b84bc12c---nidoguwut.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s42dvu5k4be31h0inposvhel6u/74508330887.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/aavo40493eb82nsquddfu3g2ud/95546708142.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/laolg67hqu6rfm43o5i27qljn8/84513795178.pdf
    • http://garmagostaran.com/Upload/file/67630478675.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1724f2a6e1---69875512901.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8f89dd8f---ronopatej.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160867f03ea026---97731770593.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=speciation+webquest+answers
    • 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_off0000fb7b.bin
d5bcc27c6d31f654f2e02f2265e2ea23cce9365f64ada604e86193e8175353db
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 17512 bytes
font_01_sfnt_off0001298c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 16792 bytes
font_02_sfnt_off000141a3.bin
f832c5af0dec60463d8c466d9c319539eb87b2ec04d25debf8ce6db1251de477
pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 10868 bytes