Malicious PDF — malware analysis report

Static analysis result for SHA-256 80585ea6ce7109ae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 05:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0e811aeba3967535bb0125b13933130 SHA-1: d46ca920515c21f232671d8b538bbc34edd33c57 SHA-256: 80585ea6ce7109ae3b076364563e0d94371b47a0f7282281dd5d50d5f12211e6
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://amdind.com/userfiles/file/44636959580.pdf
    • http://ipayon.com/root/FCKeditor/file/vemen.pdf
    • https://stillwaiting.org/userfiles/file/20735342425.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd53dcdfb---9235535258.pdf
    • http://inter-travel.hu/_user/file/37930449330.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/93711198319.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ccfcac5e9---depipobotufobufer.pdf
    • http://alacarte-husum.de/userfiles/file/86828920707.pdf
    • https://kisikana.hr/userfiles/file/vomobudofedapu.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30130534557.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9trbcbti6pr12l23jfaf956do7/93074636002.pdf
    • https://beautydent.hu/editor_up/21309585008.pdf
    • http://naturallabs.fr/userfiles/file/soruzezawudebipudogonefet.pdf
    • http://vhktn.at/images/content/files/zifosilikewibalitu.pdf
    • http://edu-soft.ru/site/htmlimages/file/71482137825.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e240a3c57b7c5318cc3f9d2760bc9346/sakojetomoda.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f76809d227f3b4bb3247f0e1ccb304f8/87227951906.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f18d1bf91---palexunefebafuzuxunedi.pdf
    • http://nmglyxx.com/userfiles/file/2627001096.pdf
    • http://architects-desk.com/uploadsfile/mutalo.pdf
    • https://lescourailleurs.com/upload/editor/file/67355158061.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=discovering+statistics+using+r+1st+edition+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_off0000d7a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
font_01_sfnt_off0000efba.bin
457d554fc51e02e5ce6f08a57858bcc365a4e5e3a57fda135073e653dabf7da1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 17676 bytes
font_02_sfnt_off00011d8c.bin
cb225b3137ca07c74bf66d588113e9e0ef860d9741a07ba58679664b09b48def
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10968 bytes