Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be7087afc4aa006…

MALICIOUS

PDF

96.0 KB Created: 2021-08-21 11:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adb761e509eb199fdaa50bf8904630f6 SHA-1: b56fdcb94520a8a1d90ef2fbb1f4ca3383070140 SHA-256: 1be7087afc4aa006cb88e5ba290c7bb70fa23277be5f98d65f70f1f4e75a0281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://daiichilogistics.com/uploads/news_file/popibojaxunixepidul.pdf
    • http://sh-songshi.com/admin/upimg/file///85718565961.pdf
    • http://tunglamgarden.com/images/fck/file/17285558500.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/241c9ea638db059fa40a36e1bdf1b301/wurige.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11058727---lugatixodevubelogusudo.pdf
    • http://benthanhsgfarm.net/images/uploads/files/59919439311.pdf
    • http://elturo.ru/img/upload/files/56541173707.pdf
    • http://eatatrudy.com/uploads/files/97824985007.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd238d7921---28291384970.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fea76585c---jobemaxosepebabas.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d5aea4aa0bcf9e69da2763f9cec999ed/dalatir.pdf
    • http://vnos.vn/app/webroot/uploads/files/fodudopixunadogap.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d5881743---repaxolamega.pdf
    • https://medsplus.us/admin/images/file/22005567779.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7vpgt2odqg1o4a1ci2ospintjf/21801726707.pdf
    • http://jevades.com/aircraft/fckimages/file/fuxuxorotitanaxifiwuzitez.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/770e9003a9b4090066280ad2fa59682e/57861289291.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6e66ae770---81345675958.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimeguvirajenaxame.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/zisawoguzemajukidanit.pdf
    • http://mytaylormadefamilyusa.com/clients/864113/File/38711631716.pdf
    • http://kidsjeodo.com/images/files/lajetudaniridefaxad.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/agf3dm0mr9mtocll5mlgbkdin7/gulefibokisavesidakodaziw.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c441d1052b3---majevokoveluxivepelaf.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/32162008617.pdf
    • http://softwarefactory.nl/images/file/18328350515.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/5387623429.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cuales+son+las+principales+caracteristicas+de+la+investigacion+documental
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
font_01_sfnt_off00010d9b.bin
caa5cb37f9667f3f73635c763722439225c89b9f49c999b61368437ea02e437e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 19776 bytes
font_02_sfnt_off00013f44.bin
04ee049208bf5c6d2e05824e661a9dfb1599c5f7318630f59d4f219a8448512a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F44 11052 bytes
font_03_sfnt_off000158cf.bin
915c83616028ac75c7aff43ffa8c8bb1a3877bc8821db44c0945d237dfb9d556
pdf-font-stream PDF embedded font (sfnt) at offset 0x158CF 16180 bytes