Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f43a68d6c34b467…

MALICIOUS

PDF

71.7 KB Created: 2021-09-15 09:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79bc30b83eb4e691762cc006d1e449c0 SHA-1: c5b2e906fc40fa60a1551123ac9aad67c66e063c SHA-256: 3f43a68d6c34b467a7e8ac2035c13dbd4c55362a40870ad1bd98a5cb860b137a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs and link farms point to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=operating+system+concepts+10th+edition+solutions PDF link annotation
    • http://chornakorn-packing.com/ckfinder/userfiles/files/sukezemopafogawozukaxav.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/2004504445.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67683717810.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/31221468722.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/juboxujidinapisopuz.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/61778186472.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e47170fc---7908094346.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1tbg80c74b7h22l7la09370flp/pujodamaronex.pdfIn PDF document text
    • http://sushibelovo.ru/files/97401721927.pdfIn PDF document text
    • http://thedreams.cz/files/67154018090.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67076811099.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/53929151426.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/21721386649.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/60853387699.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/vazosa.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xunonenepud.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/91808624984.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/11bfa4074db558b925e540b31d6a09d9/nuregivo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9c614a1---vuxomivipigibuva.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/27572976263.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/63055824264.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cb0d58b1.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109120918408606.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/rufubibifepevip.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_off0000b696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 15580 bytes
SHA-256: e8347dca5d177662fa3b6a84c3408a4ddc5dada63415f86e2938b28bb14cc581
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 11376 bytes
SHA-256: bab0853818996e22391b34f11b43b047e69ad24997a7ee91c514fdde19cb0653

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