Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1f86697b82d830…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 10:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37ed9dee828f0f252900f5f12246ada8 SHA-1: f3078a48dd976dcc8ae3ec0da02c4dc6f5270c02 SHA-256: 0d1f86697b82d830c7dec7b70ec85b6a594f6e0ee85d2810af45c83433dd245b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or redirection attack. It contains a large number of links, many pointing to compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=precios+revista+motor+junio+2018+pdf PDF link annotation
    • http://ediljolli.com/userfiles/files/zopufi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d32ce521---vudikajevonud.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vufevemarugexavazoz.pdfIn PDF document text
    • https://rotitelor.com/contents/files/vitad.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/wovakubovudosumalumonog.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/newavigekefi.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210901071938.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb131eb86---33259434704.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/85894380973.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/nevofomativisabewezagojof.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2618c735---pexigu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/43077824858.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/95373283535.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/wotodab.pdfIn PDF document text
    • http://hnspkjx.com/d/files/lovimetenig.pdfIn PDF document text
    • http://medi-sen.com/files/files/77360826019.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9982005e65efd1ad896afeccb7638d34/32070049079.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1429e6b55daeb8e69a4bda18f4e5e22/fowafituker.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079772a9acd7---danewowapifidofuko.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/38784635037.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/rovepidezoma.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/34749326616.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3b7aaa78---95290652259.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/bopozitejadasekivafemu.pdfIn PDF document text
    • 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 11532 bytes
SHA-256: c52e2c5dd922a1c635ee60bae5850faa756bfbf5b8eb0e0d3dc7559ef68bec90
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: a7ff177ba86cfc2ada61c6a918178749b03f267b699b695eed13040a78c4c1f1

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