Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a1895d743ad3ef…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 12:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3630c5c7e72142da9be9db481dfe8470 SHA-1: 18c4b6c5541944f6e929865a3e09f27d22a8a7f6 SHA-256: 37a1895d743ad3ef4548c379ebf4e64f47a1ac54cc5461101f086f7f7a6dd9c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on what appear to be compromised WordPress sites, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0b13a37d8a4bd5a9aa052431948975b8/87756498649.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pizimuv.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/85958097075.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210606115534.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e4dbd360a328b350e63b21db53cc1b7d/nawefaxadizezodigukukewel.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/gulezegunaze.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/muzumopizexodera.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/925f2f05e6e324273b7cce0670b4b97f/batizixome.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lubexafubukuriwixuxakobi.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/nimaduvadezisu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf72d63d8---82747905350.pdfIn PDF document text
    • http://recrute.fr/files/files/62487651270.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103443e241---19458046885.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c832c6959---50569545355.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/19645333181.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/994f4ba7399cea93ed15667006113a0d/vovipezelaroginuzazefulo.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/relojitixume.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/137e873ff522315f26e3c9a27a35374d/wutozukejiwubugesuvepodi.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/34654476633.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/wotuseje.pdfIn PDF document text
    • http://tms-operation.com/upload/files/tufakata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+unsecure+a+secured+pdf+without+passwordPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 18012 bytes
SHA-256: a47f9726d82aa30180a839ab9e707e06b125eac6305e78e76eb1b59a1208bc8a
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10848 bytes
SHA-256: 415df3f578ed81f2e8c889fdd304f6ce783797f35bcd6eb25ed1967e40d02fa7

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