Malicious PDF — malware analysis report

Static analysis result for SHA-256 7625d153a5dfbed5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bc687ce1e42887603fd0095a5bef3a0 SHA-1: c8f158555cf2b63ca04d3a1904aeba4f08bb39e7 SHA-256: 7625d153a5dfbed5f8e7c307cae2981776232b2c86eb652837e2de07df0b7144
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 websites, suggesting a distribution mechanism involving link farms. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gc-antey.ru/ckfinder/userfiles/files/78514065440.pdf
    • https://kaptenhoki.com/contents/files/7973268712.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a156860030---funaxufuna.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/92714475136.pdf
    • http://aceonlinementors.com/userfiles/file/37818099853.pdf
    • http://doggystylzgrooming.com/admin/photos/file/nulimewademunoz.pdf
    • http://kondicionery-himki.ru/upload_picture/file/lijetusuvusejozoromiji.pdf
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/sidepuz.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/9123857650.pdf
    • http://hoangnamjsc.com/upload/files/75622396569.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9312c272ace79209dbd8ec2d90554865/61335237738.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/45983940810.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12a398ba856bad57a66902530604aa2b/kudom.pdf
    • http://www.uc-kushiro.net/images/library/File/pemiwivalibadupubonasegir.pdf
    • http://clean-ecology.com/Upload/files/1417917533.pdf
    • https://theipbuzz.com/images/file/96472229513.pdf
    • http://achilleferolla.it/userfiles/files/82577154479.pdf
    • http://surmounttravel.com/userfiles/files/rinisivu.pdf
    • http://simsvizag.com/contentimages/file/38381593060.pdf
    • http://alacarte-husum.de/userfiles/file/22267211072.pdf
    • http://ketphatthinh.vn/upload/files/fikeriwupidudusalukivarol.pdf
    • http://asztalosweb.hu/userfiles/file/15482523330.pdf
    • http://medtravel.pro/images/hand_uploaded/files/82083095650.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/31086764687.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=workout+master+game
    • 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_off0000ded2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16792 bytes
font_01_sfnt_off0000f6e9.bin
2025c5807d84118cbfcf9f946236c1b42a92c9803d7575eb0cb1c8d5870c9a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10392 bytes
font_02_sfnt_off00010e8a.bin
2d01170229b46e4772fa6435146fd7f52fb54dec7aff7e358c2477ec9ccdeac0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 17692 bytes