Malicious PDF — malware analysis report

Static analysis result for SHA-256 9773190e545301f9…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 03:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3fe722c8d2477e8277b012e928cd3b4 SHA-1: 1a8d9cb76dbc11005fd5750524aaf9dbeebcddec SHA-256: 9773190e545301f99eaf52fa6196aeac43b12681c6962fe018ae42417ed38baa
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links and SEO-disposable link farms reinforces the pattern of using compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=solaris+manual+pages
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4afcbea67---fasuwijupoxijifeboda.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/81384132565.pdf
    • http://ankurgroups.com/userfiles/file/24616563477.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ebe27f0b---8965127726.pdf
    • http://al-bandak.com/userfiles/file/25994699587.pdf
    • http://talleresjpg.es/img/file/69123527790.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/venopuratotanadiz.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0fdc8c1272ebbb68e5991c93eb9780c1/56539499192.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4cc64ec4d07bc0c17d0ba0ac5112fc2b/82266413990.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16078796c4754c---ranug.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf98403346---dogadivuv.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff271faf8---70026994520.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/op4q2fh80f3996s6btb2e85rvb/56265692268.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/45819sjj1neq1b2rkpbrnon0f3/zobamikosibu.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/84fa22a9aca5506da25ae5379be315c8/49130144986.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ddef6ab38de058485bba1cc0ebd1222f/bogogumikiwanalalavomiso.pdf
    • https://aravlicraft.com/cmsCart//upload/file/34597095310.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce8268674---kozalumogix.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8244baef9---midivekovomuwaxonid.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b318b0514a8---nunujazisifisoku.pdf
    • https://vannordenvastgoed.nl/userfiles/file/56201370821.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160942bc56f9d9---81180297528.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin
8ce70c6511ae852b7d3c3fc4b9be47e0c7beffb47ce43d86cafdee1c2082073a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10672 bytes
font_01_sfnt_off000113b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
font_02_sfnt_off00012bc9.bin
ef7a997c32fd92214be11731b8692662fa363f1d890991c1c29a69c63bbe6b30
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 18312 bytes