Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d03c1de6f68965d…

MALICIOUS

PDF

92.4 KB Created: 2021-07-08 13:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5361227380205550f6e76858aa6944ae SHA-1: bc7cb4efa4f45fd5edacef1f760a4ab271f528d3 SHA-256: 8d03c1de6f68965d9885c1ebcc7c70ac29468b3bdd4c6de9cf22e252f2d10706
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094804076425---kivibuwepovikofesaxuxamew.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kulogi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4e58b701---xetejulezodat.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tonari.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/ludewavaronewuteko.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mik8k0i34ute9gr060n62p079i/bopabu.pdfIn PDF document text
    • https://atl-50.com/files/file/78310744255.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/molireforubozupen.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/24984777352.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c8aa4bf3---38917384075.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7fba2217---gupinegiviradumoro.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5b64e05f8---fimadixobamuduretonaf.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n2p01s8i3u81er5htmv262lhc0/woxibagakezinowuxev.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/3037206158.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/laxanupim.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becb9b481b6---govigokigamaluzararaxaleb.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_B6C68E3758E2577B.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.pdfIn PDF document text
    • http://siembra.me/uploads/files/tibupawogemuge.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7fba51bd6be50c7a298694bd785ace37/92055012894.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/masenawig.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a3c93e60b51d83655c18d183c4782999/sadikebetomarejofovusete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=birds+of+a+flock+fly+togetherPDF 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_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 17020 bytes
SHA-256: 8bda9b3fd17243d7b0a39fc7eedbb9e8de52f2d96ae68190a4577c09afc604d1
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 10912 bytes
SHA-256: a9d2f262a3b10436f936471e0e934ee114496d13ea7d4810f2eba5251fe987c5

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