Malicious PDF — malware analysis report

Static analysis result for SHA-256 a090bcd06c85f8db…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 18:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f1a99043149936db00a5ff90b0f0e185 SHA-1: 563291efac464d927412eec57e6d64f577d8c06f SHA-256: a090bcd06c85f8db4ba31e58c165be7d2cd41401166419ab96e3cb95347ee56b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://2sisaccount.com/userfiles/files/56970566622.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/10002543488.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/zixewamafebixojasib.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/palupemufekosowuwub.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/supiwebu.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/56023069625.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/xizujexaweroramudejifomi.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/21995841044.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/88475216666.pdfIn PDF document text
    • http://ellev.fr/upload/files/jubedakotokizoronogigaluw.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_05_54_53_8996.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3366720ee9e50a1049fb236c2c7b8b93/50488344893.pdfIn PDF document text
    • https://synersys.fr/contenu/file/15696862974.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ofobqdkh69rfg9n3vdgq3me94g/tikofokumame.pdfIn PDF document text
    • https://kapefashion.com/files/files/nopil.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306c0959d47---10680016999.pdfIn PDF document text
    • http://royalgroup.at/tmp/4748919697.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/49830767888.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22685919138.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/58186164960.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/zaretibidiwasagezade.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613834420c2e7---83410715756.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/jutimijotoju.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/65690179960.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/26968280553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=heroes+lore+5+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 10268 bytes
SHA-256: 14dbd99dde966107c9d5e9dcdae4744df401fcaac667312e88f40444445aced6
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 18544 bytes
SHA-256: 8c312d71fe714fd14b3419cbb4fd56da91df9baddb3abf14914d8dac884b7855

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