Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bc67bffc172fd5…

MALICIOUS

PDF

84.0 KB Created: 2021-08-16 07:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c53108bf6ab9d9a61ec6af8bc42c98b9 SHA-1: 957635de5bb6c3f3ca800c3f8f73fd6cecbdfa1d SHA-256: 97bc67bffc172fd57dbb7ab2bffe3752d08e9b659484fb64688905099d45d2a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, many pointing to PDF files on various domains, suggesting a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest potential for malicious redirection or content delivery. The document body is heavily obfuscated, preventing analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yukkumpulgroup1.com/contents//files/61924173951.pdf
    • https://haysalon.com/public_html/userfiles/file/43757078152.pdf
    • http://gowowdeli.com/uploads/files/66143633030.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6287d20bdb576351f11bab356e2d6b17/91027341486.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/gugamitu.pdf
    • http://yevres.fr/ckfinder/userfiles/files/99047205383.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0f517f22da371c242fa98318effafcb9/12581191737.pdf
    • http://artpolyclinic.com/file/files/mulepogizitejote.pdf
    • http://cachnhietwin.com/luutru/files/59543610423.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e1e01d4c4ffb7943860df073628df274/20833932333.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cbc195dab---doteruwukawokunuzajuzez.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d279930382---fuderupedupawefip.pdf
    • http://kraski-chernila.ru/resources/file/pewejojoduwadapud.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1734d9f84---16434772987.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/zemiroramivez.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a0c60f5373ef64a287e4d9a228573217/dezowetujevuzofap.pdf
    • http://refpecsbelvaros.hu/kepek/files/vakazaraxoruroxubosox.pdf
    • https://grandegroup.net/files/gazoseb.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/wafidozezijibuseg.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776145e4a1---94629322072.pdf
    • http://riverside-plaza.com/upload/userfile/files/46344043625.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qb56pmtfjnbctfj7gn4j8t08db/wegaxeligevamoduzizor.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/41716556301.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+a+monthly+budget+sheet+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19b.bin
0f0544e65958300802624755b5539967f3e2a8d8d3c58757deece60757d4f18c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17332 bytes
font_01_sfnt_off00010ee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 16792 bytes
font_02_sfnt_off000126f7.bin
4f64921a48e1067047a563bae0cab0772e24cd249395ebcbf1ef9901d189af8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 11344 bytes