Malicious PDF — malware analysis report

Static analysis result for SHA-256 2716f99decda1baf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f76e5312e8df75e60211ea0608c2e31 SHA-1: 942d48ca7e55ef7fd581b157b2cac94561c7badc SHA-256: 2716f99decda1bafdefe0e3a855afb82bbfbbed12c00c01bb57e650d88f3c409
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tarsiman.ee/files/file/71833909207.pdf
    • http://pcwenhua.com/uploadimg/file/16243470912086970212.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/26785981336.pdf
    • http://aliceinformaticasrl.com/user/pages/revapokadekoxe.pdf
    • http://www.larucheapain.fr/ljk/file/jevirober.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bjtums6u2oco62q4jvf9bapb6i/45252119180.pdf
    • http://kehlux.lu/userfiles/files/sidopakodagigo.pdf
    • https://mobiligennari.com/userfiles/file/tujebabitatev.pdf
    • http://shoreluxurylimos.com/userfiles/files/36830944414.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfcd742cd0---joxos.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/manofu.pdf
    • http://k1a.ru/images/files/file/lifozawulijifoxivi.pdf
    • http://tplustech.com/images/ckeditor/files/12699019262.pdf
    • http://citra.cl/userfiles/file/20078713217.pdf
    • http://dzirerealtors.com/uploads/36302536757.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mt2cailmpadi63enh17bef9ib9/duwadenisamaxuvof.pdf
    • http://rileyillustration.com/images/agency/files/54318548268.pdf
    • http://radio6deenero.com/uploaded/files/89598575790.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c35e5c7a70---ruxovuwedud.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae5b3adcc---xurabovelokugimoro.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pdock82ratsugnn49d4kbob8d5/83630007054.pdf
    • https://rm-parketi.si/uploads/43687060438.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=radical+equations+word+problems+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_off0000d556.bin
373cde7b5c3e45d76015043672b5c6bca8b369aa29e44c3e4664f9b14ed4c3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 18480 bytes
font_01_sfnt_off000105b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16792 bytes
font_02_sfnt_off00011dcb.bin
54f7f4da25ade30e90878c1e9f31bd87f906550210730ac6ca338a695be66949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 11296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.