Malicious PDF — malware analysis report

Static analysis result for SHA-256 a904a977e60c2ba7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 18:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e069a7f6b871fb88cd3e88a10376cbe1 SHA-1: b0ba757b6616366d0856abdf44431d7dbccd2099 SHA-256: a904a977e60c2ba74427100a1e2fa316a427100d1d1168c58d4e19b67ae206ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript is likely used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=yu+gi+oh+duel+links+apk+download
    • https://hattshopping.com/admin/assets/images/ckfiles/disolibudijuk.pdf
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/juletasoz.pdf
    • http://tindangnhadat.vn/upload/files/95256206472.pdf
    • http://www.siposferenc.hu/html/bobobide.pdf
    • http://strahyi.ru/images/file/75829698195.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/94444745369.pdf
    • http://daithanhnam.com/upload/files/51630773069.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/jupijazaxesasarimas.pdf
    • https://maryamghiasi.com/images/upload/files/gupumarepavedadotonarejev.pdf
    • http://straps.by/ckfinder/userfiles/files/96211015626.pdf
    • https://wedding-photos.cz/userfiles/file/detasimeloga.pdf
    • https://patoman.ro/ckfinder/userfiles/files/jukumesakopebaxezire.pdf
    • https://thepainter.asia/upload/files/15262351770.pdf
    • http://hasicimosnov.cz/foto/Image/file/27814304896.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142369595036---didomumuxol.pdf
    • http://grawerlik.pl/userfiles/file/wadogonesepivilu.pdf
    • http://aaz.sk/editor_uploads/files/jagedupawofovilexobim.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/86363182860.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406a603f9f1---taromufiviramusazifo.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090814063773499.pdf
    • http://arcadia-fitness.es/userfiles/file/89406925041.pdf
    • https://aspirans.com/files/file/26708404085.pdf
    • http://khojedu.net/userfiles/file/21926366843.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b746060349---79223342307.pdf
    • http://pitchdecor-construction.com/user_img/files/lepuxaxuvup.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_off0000b352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 16792 bytes
font_01_sfnt_off0000cb69.bin
5b2b3bb7dd2ec2d70abf6cecd633a1b88eb838601c6275fda314ec491d55de52
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 10732 bytes
font_02_sfnt_off0000e3c9.bin
a48886d56e3dcb8a5059371b3791f3528ef8be02d13567c0381c51ecdc44c39c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 14412 bytes