Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54bfe2aa0967cce…

MALICIOUS

PDF

82.3 KB Created: 2021-07-21 09:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1ae5b82ee39ea3055129a63f7a86a96 SHA-1: b93055e072cb2c62f8c5a99b96b77d91d83d6b51 SHA-256: c54bfe2aa0967ccea7de23b39c0ca4e55abace854e2a53267fcec6c503492279
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2ced0698ef55a960adba84c5355210a1/90934159314.pdf In PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/1242726617.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/83576882919.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/35383351667.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/1939746359.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a193777e5a---30801174685.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/gotafaxevumidew.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/98863724041.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/66gdlde41b2kdgl64dn6dsvks0/47825382130.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47499639445.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7b5cb9a9ecc176d459d39144e19fe57f/76420923153.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dazebuladafemaw.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/76aa031381e32ade2b0d6f226f0945c8/41547403992.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/39198227624.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36cd9d9a3---rubopesofisabivixupi.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/54458725067.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/113q78tps2u65rsje8se21gp34/zesanug.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/64604526295.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/gopuzipexaredolejasojaz.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/38709006627.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/rebutorokumipididuxagev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/86ceca35259376caa41a4f0b9aba57b4/99538013739.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098430440a7e---94289647477.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac66235af---38945460045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=linear+inequalities+in+one+variable+examplesPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 10924 bytes
SHA-256: 12a263265dab5bb08547737adcf891851138a65e42e01f6d738b749a90f5720f
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 18016 bytes
SHA-256: 5186ea3c730a14eee3ee1e1e0197ad3a96132e1050c3de51481d11e5bc74071e
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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