Malicious PDF — malware analysis report

Static analysis result for SHA-256 adeccd1ecebbbae1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 11:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d14bd144d4ff2de0db6d3c90708c655 SHA-1: f8d3934defead25378748e4b90db3b41e60437e6 SHA-256: adeccd1ecebbbae19894202356f011d098298d1034ceee7fd63a6b2788e291b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rucodelniza.ru/userfiles/file/lirapazog.pdf
    • http://nowyhotelik.pl/userfiles/file/37665236148.pdf
    • https://almuhja.com/ckfinder/userfiles/files/60919382383.pdf
    • https://tbsva.org/Upload/files/20210729215402.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033e1e6ca0a---tetaraja.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba78f67e88d05129bfdee2d96eac6d48/nivugafuzirojura.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/872371e57685e056dfef7ec579b24466/28647353557.pdf
    • http://beiks.info/public/file/47423232470.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/woresejewekokadiral.pdf
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdf
    • http://dailyxedayhang.com/userfiles/files/23828834059.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abaa13abc7---87609566745.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b82766c764---pavowopododenopoza.pdf
    • https://bulendengin.com/upload/ckfinder/files/tarazosepepimewo.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b458aa0a---punadeno.pdf
    • http://blackivy.pl/userfiles/file/vimosokukomomadalituzuru.pdf
    • https://mides.vn/images/ckeditor/files/91200620453.pdf
    • http://boxshop.mn/userfiles/files/75496123365.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8303fc8c77ba3ef380eedc0313ed910c/40144500985.pdf
    • http://www.elstar.ru/uploads/files/mesafiresepawa.pdf
    • https://stef-nancy.fr/upload/document/kavisesolebogut.pdf
    • http://prinsart.ro/uploads/files/8323721539.pdf
    • http://pphu-joanna.pl/fckpliki/file/worogexumemakirofedo.pdf
    • http://suacuacuonthanhhoa.com/upload/files/xadow.pdf
    • http://tv-kitchen.ru/files/files/fizesavagusaripasepi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0f8babb92c4c3a858581127e1a712588/marajolegotefob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aspose+convert+image+to+pdf+java
    • 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_off0000cb55.bin
d5d1edcd1c37c042f381dd0c3eddc5c83dc32926d7dad537e88a15cbf358b30a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 17608 bytes
font_01_sfnt_off0000f90d.bin
6425d46be71f9697d966cbb46140914dcee24518228488e6ca5342d17b786e97
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 11092 bytes
font_02_sfnt_off000112bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 16792 bytes