Malicious PDF — malware analysis report

Static analysis result for SHA-256 691376baf6c44d7f…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b3291d8d9c4ce8ec0337d1c3edc727b4 SHA-1: 20c0665a1ff7f90af690beea8d2b8b0fe93f0769 SHA-256: 691376baf6c44d7f26e6088bceffff6c27c31fbee75ca4f1d4ef42bbdd29ec7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the link farm structure strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/oh002p2guo9u91k08n1ct8c3q2/kaxolipumiliwamegavenaxo.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bcd5520e---naket.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/bce493924c3ec0ccf0b37cbef4ab4e3e/57481535049.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/70e4677b1b51d26f55d878b3060fa745/tatulemevizaxanevugojiso.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb823a37e---nenubin.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b9d73899eb6a4a5916dc92d53cc65be6/bogitoluruvub.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926c96cc6d0---44795100753.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/714370b263dd8918653ebfb024ff0ca1/2894584714.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xonitawulogiwovigikov.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a0b8ca83c568a9cb7d0fc8eec4391064/29430648823.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5g9unno7q43r3fpdv81l14foe/kuzebenopija.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kinamatafoz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27a2c498---58740595670.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19a36eb10---molelidarirajolinebot.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4490ace9ba---vujefop.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96d4465ae---bilanefanegulizufanil.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/91382223893.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/37c969861e210a229bd57a6e48ed6b17/90628911579.pdfIn PDF document text
    • http://bjallstar.com/upload/file/45012125304.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjlk4h2a337l6p5tj3uu363lpc/tigagagezezotibilamolipa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518ea57662---96284068631.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ass7r9g0pslia0hmd1orlbla4k/vibuwomasinumenudubitoza.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/92314rntce5dbt92m7vv3p8vh3/gawonutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pagemaker+questions+and+answersPDF 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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17372 bytes
SHA-256: 5abbe6c40852c490ebff82191df4ec380647d94ced9044b85adfb5715ecae2b4
font_01_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 10972 bytes
SHA-256: 214bb07308489916532c4ce21952c81701140c64634e3c5aaab79cc2a6ab166b

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