Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1a74cdcdd49438…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 02:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d81386813b6b677efb01105929b9e24 SHA-1: 21de2ba4e3eeb46304aa31947d540605bd6f2ebc SHA-256: 9e1a74cdcdd494384501a9245c346b62cb3346bacc84ce1de4f37d4e589941f5
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=android+open+source+file+manager
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/novetaxadonulewip.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/tuvadofelexoninusubuxawi.pdf
    • https://atl-50.com/files/file/tezogukupuwipowomovibin.pdf
    • https://gonguyenkhoi.vn/upload/files/mofuladuwugometaxe.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/wotitowamabedijifexubeki.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210924/file/16324410263773.pdf
    • http://stonebreaker.at/melawabu.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97441801344.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9aad8364c61be0062f08614b0444a8fb/wepiravizujuwesovepodaxi.pdf
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ce0ab11ec1d5dd6a83d76862e3975e6f/93619639917.pdf
    • http://tootingtaxi.com/survey/userfiles/files/panopi.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/xiseriw.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/podukanobibozavuwaxiba.pdf
    • http://tencanpowder.com/d/files/sanofebe.pdf
    • https://aldapa.eus/files/galeria/files/75945399598.pdf
    • https://ratco-hardware.com/Ups/files/95512986290.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/60896931365.pdf
    • http://wirheiraten.de/images/file/wemuvupovagerebe.pdf
    • http://illinoislivestock.org/userfiles/file/16035013526.pdf
    • https://novahealthclinic.ca/userfiles/file/fipujazumomezip.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/86721571719.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/kukemelawofibaseseg.pdf
    • http://motocams.cz/ckfinder/userfiles/files/59065094203.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tilikuvojapubeloj.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5f34f62592b050d43a394b38d31c0ec2/82853199207.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_off0000b724.bin
08dbd463721d6ad58951a537ed07d48fc136fa7ab7a85ec18b3e1087c6034ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 16292 bytes
font_01_sfnt_off0000e0bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
font_02_sfnt_off0000f8d4.bin
123a6973c717b756bc3bfeadd2088f6d199e5f03b595d72732870e31540bf59f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10948 bytes