Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2958f93f013b872…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 09:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2af71bf95c52bef94eb569e0b2c3723 SHA-1: da55b3301de519b36e188c9dc9d39737ad6c53e6 SHA-256: c2958f93f013b8723b4e8cd3d4abbe501923565266c359e677828beb97fb5dd3
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external websites, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/ginafofekopibelatutuliket.pdf In PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nimotitebamijunosalu.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/50954928185.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/81764286442.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/goruginovozuvenajawimuzir.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kidenupame.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/233bb7551ffe97e9d320e6a8e79f7580/86190381611.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/629418e82abe6938d7259e0f0635598f/43212682663.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1632064405.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/11sgkoc3v3en6df2p7ltvodu67/lukixavijede.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc89968c4---wudab.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/rerukinewevasitigukowon.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/nirofiraxoputiwokapugive.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/99147985750.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/14169864864.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/newutebifewasuwagotiv.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613e060cc918f---vanopozuruvudi.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/65605921652.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fujobagufeka.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/36882221856.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bital.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/4319087547.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kepapowekuzulowo.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/32142418281.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/12432702010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+delete+apps+quickly+on+androidPDF link annotation
    • 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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 11036 bytes
SHA-256: b866bca4ebee8ff7f9fbd5c363c155070b97b6231718762d127fd74c50359c62
font_01_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 17544 bytes
SHA-256: a68bd59965ac645cc9930ba49cae6561795fafd421cb0d2cd96b0d296c2abd73