Malicious PDF — malware analysis report

Static analysis result for SHA-256 35368b3e57b1574e…

MALICIOUS

PDF

78.5 KB Created: 2021-07-31 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4adf8ac862fb1712eca5c54c5d1692ff SHA-1: f9743804fad189befbc97abe6a6db466334b54f4 SHA-256: 35368b3e57b1574e88cfb7fb7bb493edaffdb49cb3fe08da0797e7978db34207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=longman+academic+writing+series+1+pdf+download PDF link annotation
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14015418260c42c0b0619e.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/0c73918afe11d4b62f4a2380fbf7c71a/82799055795.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/7489721524.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/96855116511.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jujixikomiwofadowotar.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/24681681228.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nbo15bep653a8vq4e2qi5d2p1v/tovuvemebutetubopobasak.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/76472105757.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e66132115---78428951866.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839465672ae---kekewirazalol.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0i5qc6s704uqobbv18sl7d3udr/85012492466.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cacad05ca9b---jilivobekikufimukutope.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/mawugetanatilelilut.pdfIn PDF document text
    • http://mesterek.net/tmp/66971805776.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/55072043852.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b5922454ee406675852050e9776acb5b/81271429962.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mfrg6luskokq51srifo4m1ghh7/96046142928.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/82380185876.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/xizajig.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f798458f84b259fb6ede473862d0b193/84063374401.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/49544337094.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e56c8be69---21899651494.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/13276ec64e6c8b1eb24ae369c8ee383f/26181064532.pdfIn PDF document text
    • http://zxsolar.com/d/files/72611693878.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/82580248988.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_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 17192 bytes
SHA-256: ccda1e6422cc8cc2eb7d4d7f22f4627322d51401905467a58849a2bcfdb1bf9f
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 11060 bytes
SHA-256: cf825ff701ce04aa2328c2775b1258766e3d68c45c3d0a9ffbfb9373ffd2cefe

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