Malicious PDF — malware analysis report

Static analysis result for SHA-256 7981582fa3fa2b28…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1198e616be8c1b6a93d6b1790dc206e SHA-1: 0c1248dcc97eb93e6a2d4a759436ac00418c0d0f SHA-256: 7981582fa3fa2b289eeb90132aa01729295120b6160b514fab6f6d059d4cd85f
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to potentially compromised or disposable hosting sites, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to deceive users into financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://numismatika-nbkpdy.cz/userfiles/file/wobekusipewiwatigipijad.pdf
    • http://klm-co.ru/foto/ck/files/nafinekazojotojilosonu.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/lijug.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3d98f8a---68709167875.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/volakewagujiwo.pdf
    • https://tanhaithanhvalves.com/quangcao/admin/file/rodozitogowip.pdf
    • http://peoplefoster.com/pliki/28320386130.pdf
    • http://paraglider24.de/pics/fotos/1/file/nejalegevarufaduku.pdf
    • https://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdf
    • http://muszempilla.com/files/file/zutozu.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/golekotibupofumukafat.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_211550.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161420c9e085fb---rebikumebajabaneteb.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210906_190527.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614581b5bc717---14280839536.pdf
    • http://kramnyca.info/img/upload/editor/file/fedepazin.pdf
    • https://ikansambel.com/contents/files/vozadudowowol.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/nuxirumasosuzaniko.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/1303726690.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f2jfbqkou1fqjecnrcb6atqurd/6115726241.pdf
    • http://ehomerealestate.org/images/file/99499969097.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/sekufevajoxepuwaxop.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/10280513878.pdf
    • http://airsoft1.ro/files/file/tuvinizuzibomomota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=frp+bypass+tool+for+all+android+phone
    • 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_off0000edf8.bin
c261982f6b8f838d1983fdfde37ce326a551683296a49a8bb3f7acaa31aea105
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 10828 bytes
font_01_sfnt_off0001069d.bin
0215804b5c9df40e5e2f7dbab8caea51a9b83883b2d76dc4b618f5cc09ee1b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 17660 bytes
font_02_sfnt_off000134d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16792 bytes