Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b7498b3383ae7b…

MALICIOUS

PDF

92.1 KB Created: 2021-08-10 19:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8edda3e43a2e57d3da9f15633eacc37a SHA-1: f9484a1cbc710dac17557230ac4bd99ecdd8b4be SHA-256: a6b7498b3383ae7b0b7237cf5a6f78a5905b1fc6b39a6df1a1ee45cfcfc423aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ta-taiwan.com/app/webroot/userfiles/files/28579670166.pdf In PDF document text
    • http://bptramptour.pl/files/file/1630899780.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/79033148597.pdfIn PDF document text
    • https://stopserv.ru/files/file/97944693935.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mobufisupokosewaxefoji.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/o00tbf5hjop8l6cojvftpo2hj7/44527831803.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ae2ef0b9---79789040477.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lerinurinanonor.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pct2qerfc7mjqn0fghugngur17/86052376191.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/24057362629.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f020db5bb167e9781cfe2d4aad3d401/4418243715.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060712123345.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f4b943e1e1b4dfdf1669f1ab89b56f51/xudujawuz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a27bc884d---44624156125.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/242ef21790ad54bca396eb32e29a6701/91588469326.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/32309403382.pdfIn PDF document text
    • https://ms01bet.net/contents//files/66577883056.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/v1rmq7sr7oj84186m5jcnvdgp7/47730361142.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081941f0ac56---masuta.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/95646285868.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/05ebdb5ce815d25c8b94f25d8fca9364/52890216777.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/7390441848.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/ratolixesalozuzadif.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/seliwasoxofalafuvogaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kumon+reading+level+j+answer+book+pdfPDF 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_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 11348 bytes
SHA-256: 8f554650e6e5d3668bc985db8941c0c21cdbbd0093b1a4b858f5e547540ac411
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16760 bytes
SHA-256: 2ce50eeea08cd4cc64912b5e8bf8cddf9c1a648ae182a9976aab0a476f6a4fb2
font_02_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1