Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c09840dd622a9d9…

MALICIOUS

PDF

112.3 KB Created: 2021-06-25 14:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d004b9adaa745495e73f9a4c2d08b3c2 SHA-1: 80fc3a4d3e708b8d48ca2a52dd84e54eaddd69a4 SHA-256: 2c09840dd622a9d975c1f5f141036c70442035c2664f609bee3a03537658e018
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 upload directories, suggesting an attempt to host malicious files or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2078fbb76d---22051887101.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3a8bd443---2525835148.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caac2c4a29---25423613017.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8a97f0c56f7fa13283ad74b3cf87e183/wafifewoxepidefebimo.pdf
    • https://signika.pl/Upload/file/rumefavodagonojaxawak.pdf
    • http://kiavysocina.cz/UserFiles/File/kufabor.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d445b88f---22859370504.pdf
    • https://alianzatours.com/imagenes/file/14673006459.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094374bddeba---famunonogekasozuxoxagibov.pdf
    • https://nbtele.com/en/cache/fck_files/file/vedomamizijofexo.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e6ca61d0---96871548088.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a315a21b15d---40067719864.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc344f1d2---kilumulasowozupubuto.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a831ef2c---vitukitosurifelarufibojaj.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e9c3a9c6---27251380836.pdf
    • https://recapress.com/ckfinder/userfiles/files/moloda.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d19a981772fba270980804c05dc0ab0d/foketurod.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a9713fe6c911533162e950e6ba307dd1/35874551965.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=two+finger+peace
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126b3.bin
859097ffe6b2d53efcce9f60f90ebf400808106b3a6f15d31c73875174658768
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 10392 bytes
font_01_sfnt_off00013e65.bin
cc9c70d11ca1ec8509e452951e522122e2708958c611e36f0c28b4a516e2f4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 19716 bytes
font_02_sfnt_off0001709c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709C 16792 bytes
font_03_sfnt_off000188ad.bin
7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x188AD 16752 bytes
font_04_sfnt_off0001a038.bin
c5c196b4bb7e85b0cf24cf5f216ff73080d188b595be913cc50539541076b32d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A038 4720 bytes