Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50d543b18fde598…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bef1b9e4e18d95c4ea60377bd473aff SHA-1: 5e98bd747e1a186b820582d43e57a9d8839c5198 SHA-256: d50d543b18fde5988e32cd87f470403f1f976e4ebd4f8e13ea8f76a75d39b00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wastran.ru/uplcv?utm_term=palisades+state+park
    • https://kvkumariajnkvv.org/singhania/downloads/file/zezixadipizebomujel.pdf
    • http://goteneplast.se/files/images/file/13893361171.pdf
    • https://olgunbey.com/upload/ckfinder/files/fovupisibi.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9775ab81d8---fozisojirosi.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072151b2cc93---91601157078.pdf
    • http://agcslohian.com/userfiles/file/63251783042.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763d887d070---65987470806.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c56286c31f9---43655502623.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/40scncc237etieh13d60pbn69f/tujatipigiz.pdf
    • http://charivne.info/images/file/togalebugamumiwu.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/g3r5qa5o98mh4d6onm0fheu63d/besolitupopojefinajivi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/90rtb6uffp63q5c0t0q7lq080k/68367898544.pdf
    • http://akicgiyim.com/userfiles/file/bojoserikimepigabaka.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d151beb7---sifejoja.pdf
    • http://ats-dz.com/userfiles/file/66396713147.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a614d31b9ccdca33c0559659501d26d7/63062194967.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ff4c096---bafosemaniba.pdf
    • http://andrelandberg.com/userfiles/file/81274999630.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oov78ueau5m5j3n7flnh37s153/93999197367.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085435e22c91---74134818983.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160889d2d38ad3---komikiwabibotebizujepam.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f9da7719---xotixizelakanosuvafo.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_off0001153a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 16792 bytes
font_01_sfnt_off00012d4c.bin
de11950e3c3fc89a652cfb1c54c026992a496be6cdf805f7718a779bf1f39f29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 17116 bytes
font_02_sfnt_off000159e1.bin
62b4a4c3fc581a2f09e4af6d5813e25b2d4b109a2eeddb5e536e3ac4217ace6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x159E1 10252 bytes