Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c8ecd0f0845b3c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 14:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ea7a2e2fab94310183bf8490bc37512 SHA-1: e33d2509eeae0bf639aa3fa5c4b971b7b4d14d21 SHA-256: e3c8ecd0f0845b3c0184be2a309095ac19a95940248ab262142781efae0d9536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and link farms points to a common tactic for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=car+drift+racing+hack PDF link annotation
    • http://munnarinfo.in/userfiles/file/53957168399.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wowuduxalenafunakowug.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/31481748196.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3e158804b822d868f560acc6dbe08a0b/86263315047.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tizomazonitikawofewilijir.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/87673050145.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/94303462503.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nigewutolixexa.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/59415821549.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/63429487204.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kunolupoxabipuluxobul.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/tibevoruduw.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/96991915085.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907200856.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ffdfpav8ol3mp5fs0qsdrtqh6/39472101787.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vufowedinedi.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/1183298753.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/53a0daap9t50q89o7h3cp7kcrh/pexamepojovadazabuba.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/pinagurilo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/raxofare.pdfIn PDF document text
    • https://okazionche.com/files/vutuzimet.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/4735533253.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/74761682167.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905014440932986.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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 10412 bytes
SHA-256: 5210e162e8ec7c6e9a80e84b49c2682d47f8f278b6e031b3ae864d30fa8997cc
font_01_sfnt_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16484 bytes
SHA-256: 0aeac0ca8f739be56b01eb54c65a9543bb3c6561a1d316572cff3df8bf31509e
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1