Malicious PDF — malware analysis report

Static analysis result for SHA-256 23743880350eda8f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 10:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63cee90c2598d66d171cf8587d69791b SHA-1: e0bcc583ab6fd99105787a839b0b565fe4e154e5 SHA-256: 23743880350eda8fd5743002bc86431f133162622d3595e797c771105d158612
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ankaratemizlikcim.com/depo/sayfaresim/file/jerabemovoluzadirivegaf.pdf
    • http://policylic.com/uploads/files/topegelesegu.pdf
    • http://asokmontridental.com/userfiles/file/64398335566.pdf
    • https://ytdrive.com/CKEdit/upload/files/70805228270.pdf
    • http://elma-itc.ru/!upload/files/xedobapuluvivutifiz.pdf
    • http://etnorom.hu/pictures/pazebomakojikubikeb.pdf
    • http://polipack.ru/content/file/fasawej.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ie5a2o31ru2rts74cutrn10kpe/duzeborodekirexiv.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/xeruwezobunejogufi.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d029c998ab47086d6f75f04069cf8c8e/36326396890.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nomaparogagopunifowusajez.pdf
    • http://meyras-tourisme.com/ressource/site-image/files/16482386286.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1ea78799e737c444ed1d92f35e45702a/95598284418.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/okjl78ocfp90jc1mkh06pe6agu/gobelutetamejexugosux.pdf
    • http://brette-animation.com/userfiles/file/wudezitekuwov.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lbsjqhh7ljc168hucounptjvm3/3103861603.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a126b4e18d4---gudoraselivukupuwuwo.pdf
    • http://emeraldcovepartners.com/_data/images/file/nanozuvokibozi.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2fjdf51cq4k0g894kekvr9v6og/fuzemakoboxeturisunif.pdf
    • http://lltsg.com/uploadfile/file///2021060815283746.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd30b16ab---gotifozulasatiwuvi.pdf
    • http://alliance-ltd.com/userfiles/butezerobi.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3oadhgqbnlm2rh6d5t0v1fcb2j/9271080687.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l1vps8klmhrfnjl73nbq783oa5/41999040350.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/46400373094.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=authorization+letter+of+birth+certificate
    • 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_off0000f339.bin
97621442a3905fad41a3fa0fa85702bd2cc549a6178f2f56d20553ecb82bc99c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 17264 bytes
font_01_sfnt_off0001204f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes
font_02_sfnt_off00013866.bin
3aba82299298c33353bae1843bc28e7776643d1259bd92945ce2ed7903a8fe75
pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 10544 bytes