Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6f27ad755a19bc…

MALICIOUS

PDF

120.3 KB Created: 2021-06-25 14:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e44d1acbd33ab58a1ccb0dd3bf922412 SHA-1: 422c103a0307b713462fb761b0d13f2f638ceff3 SHA-256: ce6f27ad755a19bc2a418a3282b316bd537022cf97fffc17fae86f9c92ba529f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=prelims+2020+question+paper+with+answer
    • http://khodahoanglang.com/admin/webroot/upload/image/files/86400571784.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/31bh20f7ikepomcu3l4kljvidg/68903564209.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/mawowifakajuranobagaxa.pdf
    • http://klubalfa.org/img/userfiles/file/nizuxomu.pdf
    • http://bigsvatcharasith.com/userfiles/file/85961759301.pdf
    • https://badoza.net/userfiles/file/38379177788.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/47274068787.pdf
    • http://currycornersugarland.com/admin/images/file/pikiwuvomamonigubumad.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85821e46c---30872504149.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7028c29e65c19dc982381385d9d7594b/xizelupakinap.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ngssc8dct53lqgvs1tmm0dlm0a/zubidigobag.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8c1f190083dabf0672023821f95be19b/bofisojufa.pdf
    • http://dekoblickfang.de/userfiles/file/maluwakudobuxarezopirakax.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c45090e1c0751b686d7732493f80c512/vonikupud.pdf
    • 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_off00017185.bin
1d62aec8be0f39a9f10f1793de8dcdfe832ed8b643939a8c96f89df658091311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17185 18320 bytes
font_01_sfnt_off0001a256.bin
301acc50d0e6c99c64e14e344df66cc008ed5ad85fc11d9e4e64f601abde2f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A256 11092 bytes
font_02_sfnt_off0001bc1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC1A 16792 bytes

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