Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8998fe8e24d792…

MALICIOUS

PDF

93.6 KB Created: 2021-07-31 17:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 22ca8e02676437203631fa75aceba210 SHA-1: 66028cd9cf99cdacc2f25ca511fb19fe78e56faf SHA-256: 2d8998fe8e24d7929d70468fc84b4facc3d9f4dc74c43325dbe1a48b3e0fe65d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crysiq.ru/uplcv?utm_term=partituras+sax+alto+pdf+gr%C3%A1tis PDF link annotation
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pemopogalomuw.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/616180448d871ec2aa0493911c14202f/85159819188.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/sixififagadeduzedizelepo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec0d06712---lumazez.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/627526a3f37fc655d8007c19c5acd80b/4362750202.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a809f5133d---37076364311.pdfIn PDF document text
    • http://vswet.ru/f/4182408622.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wibosotaxitodozubozawavok.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb7fbe4092da3b126d47362e4fd83479/39428676001.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/bepelezefepamepo.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/33327956930.pdfIn PDF document text
    • https://sanagustin.cl/files/nazopejesivozigejef.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/f57472b95803987c0f245879a54b7184/52224598349.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tuzixened.pdfIn PDF document text
    • http://www.bash.cl/media/file/23620532391.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/65324247945.pdfIn PDF document text
    • http://come2menorca.com/images/file/35329992695.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/28443623514.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/31229189425.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/73223024747.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/46159214131.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeff0b6f1c---muronororobakarime.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b683e4b48---rejojomavolavupakudozat.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_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 21088 bytes
SHA-256: 9286f46f3bd5a2cfe08f415a1680d9105851c232664dfd5f2fc7d62c5518fb5d
font_01_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 10820 bytes
SHA-256: c9b8b7b22d01acc165b13d72d0957fb26a574dbfe55244085cf3981a6757429b
font_02_sfnt_off00014e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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