Malicious PDF — malware analysis report

Static analysis result for SHA-256 607cd9f42cbc7795…

MALICIOUS

PDF

78.5 KB Created: 2021-08-07 04:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2639d82c9cc15a0ee7fdc2be48eec6e SHA-1: 6924f2dbc1e6ac88e4143fc6c4ec0a2c6c5192d6 SHA-256: 607cd9f42cbc779531dbc415186b640701670fd4a140eb93f9df8c73886da40d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c773c9a4dc40022f3f2e9083613383b5/zijevovuvamipomobexal.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7cb449f23a85c931dfdc236a2ff9790b/wetepisozapexejisetiwanex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081123f756fa---7875160479.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/44a766e01076d8dd67ea73c08d90cfa5/luxilunopi.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/45204870864.pdfIn PDF document text
    • http://packturf.fr/files/jusiwo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/69b1e742ca73166d61f2052a22f48a8d/19808162891.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4a172749---90061295394.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/fuvogumulubedexozosopa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428140021155.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/62873147981.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814271be92---xilugakixafakiteduzo.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/daramoz.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kesevokib.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/mugudifujogonik.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/kirisokazifaguxojuloje.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42ce40490---62350102147.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/26381953447.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cb4949c1748ff8bdd385dcea1546698d/17247266308.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/96520602069.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7b3d207b---dipomavegejatatiwodek.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/kefikapupawalarizon.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/f1je71bhtg3amnqedkff7voos9/41010550308.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec35028cf6---67668241033.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/94260042450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=klbd+kosher+listPDF 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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 17184 bytes
SHA-256: 2c707833a852a8e0db9952f51c352c2f0be8f2e6c89c5285c6b28fc0e25bf5e7
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 10304 bytes
SHA-256: c594f7961285a83ac632858dd63c021e1085f95817db2393b8ed1e1ebf7962f6
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1