Malicious PDF — malware analysis report

Static analysis result for SHA-256 320f176fb6f92fca…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 04:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f0b4403447747e544bf8e4165ec310d SHA-1: f20cd1b5f241171bc4abfc273e4f3b1b3e904ef6 SHA-256: 320f176fb6f92fcac5a41e434683b67af19cf75c038f3043ab6792e0df41fc0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=manual+subaru+outback+2016+espa%C3%B1ol PDF link annotation
    • http://dilimkebab.com/userfiles/file/vegipaxutekakip.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lenumedamiduwapejo.pdfIn PDF document text
    • http://fedime.org/imagenes/11780666174.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/bijunogelutorizevogubefu.pdfIn PDF document text
    • http://serting.eu/userfiles/files/67939401993.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610761ac3c23a---xozaz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c8e0f0c864f6dc0ae09ddd521e9b74df/6242744302.pdfIn PDF document text
    • http://jarosi.hu/files/file/77940652241.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafisabig.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210619114823.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a10ih3v1d3pk4tofqju2no2vi6/lejetisinavevo.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/wamegaferujuwet.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/61257068260.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a40ad356a---24673021506.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/34384705219.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/69843060723.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/timebuxija.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cc9a176d---22958060719.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/96395119980.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sogifegatoma.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/vovatudowukenero.pdfIn PDF document text
    • https://proia.bg/userfiles/file/pevafosizuki.pdfIn PDF document text
    • 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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 11268 bytes
SHA-256: 0f095f24ae0ae9d81996ac59d1ba43c5f9546b09ab676a18d7b3522705df9423
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 18184 bytes
SHA-256: 5ce3b4ef5cf18a2f59478565673fb42607da72b7ac8b37b989b47be96dff6649