Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1aa06bb45ae63d…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 01:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d9c1ed3f94d68cbe288ec36aa700f4 SHA-1: f5d81409a75530b55caee03f67db03d2f5cf059b SHA-256: cf1aa06bb45ae63d06bb80b53a9c3e60507fcf1630d70e9c12f6c2fb04db2ff7
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 WordPress sites or use 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 distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://aayams.com/userfiles/file/74651469537.pdf
    • http://eraldocomo.it/userfiles/files/tipitivivexulezubuxad.pdf
    • http://m3hotels.com/userfiles/file/wobowotegiwuva.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/tolarigurusikerizewurut.pdf
    • http://abwninemile.com/uploads/files/pagiledub.pdf
    • http://taihegas.com/filespath/files/20210919131459.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sosadakipipabepuf.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jscvgjbu238saav2jjn8rvv62n/20971625305.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/9172593318.pdf
    • http://hugslock.com/app/webroot/img/files/22831422708.pdf
    • https://senfina.top/uploads/files/zukotimazonofijise.pdf
    • http://silver.jo/ckfinder/blanc/files/netoje.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615631963f27d---dukeginunijadamoxu.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/7589895397.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0ec7082473eeac8379ebb0732bc8a0c8/28546832357.pdf
    • http://rnralpha.cz/res/file/situmumaxijutasibodefakap.pdf
    • http://www.binghan.my/userfiles/file/witeramodixobagej.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/20353450287.pdf
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/28508485344.pdf
    • https://atlastoursntravels.com/userfiles/file/92635359527.pdf
    • http://abwingsmd.com/uploads/files/54171039972.pdf
    • http://china-miyaco.com/img/file/202192824746.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/7386602182.pdf
    • http://liveranigioielli.it/userfiles/files/koneparoveguvasizudepu.pdf
    • http://mazdooradda.com/userfiles/file/venadimav.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/gunataxik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+city+tool+gold
    • 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_off0000b6fb.bin
67d6967ac1653c3d81d5042700ab03feb9ab02f17f079f8265f7ccfc8bfbcd55
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FB 18484 bytes
font_01_sfnt_off0000e6ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 16792 bytes
font_02_sfnt_off0000fec2.bin
9784c58f27c6575abf3e188053d956bdf473fd0d06e6998724d3019966c0313f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10360 bytes