Malicious PDF — malware analysis report

Static analysis result for SHA-256 5297ca475c6e4eb8…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 20:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35f173092f47318cb8e94fed759309f7 SHA-1: 46dd9c61d4910176f341846b0b92e9d4149e8c17 SHA-256: 5297ca475c6e4eb8d67fab6f5d092a3b4331f198e9c95f90a575165ab6bacc72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=western+movies+latest
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160839f9e03a8b---37810794354.pdf
    • http://polkovnik.su/upload/file/vewexuturuka.pdf
    • https://foodvellythailand.com/upload/files/bisitit.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/30c841af2a8ff8c7e60865a90cfe1ff2/21635280222.pdf
    • http://bichvan.vn/upload/files/15238329321.pdf
    • http://www.allatpatikapecs.hu/images/file/94808168252.pdf
    • http://bright-inter.com/file_media/file_image/file/muloxosiwatifofemapiped.pdf
    • http://cdhsalumni.com/clients/28864/File/bozitati.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/18cb1d96bcc393c9e9d5ea69c2ef5571/xivoju.pdf
    • https://anctools.com/ckfinder/userfiles/files/jopixufubejo.pdf
    • http://www.yoko-ono.be/images/userfiles/file/lomerirun.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa7132143a---78438412877.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe5d35377---26676060936.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1067a8ad22504908304e5a16e9660e1e/64682474836.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814aa1f34cf---bewaroxufijuk.pdf
    • http://homelife-superstars.com/image/files/57565059144.pdf
    • https://fentesmakina.com/paket/upload/files/jipojiwivezomez.pdf
    • http://allycatering.com/userfiles/24592314528.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3a2487676541f256a9c8b690d9baef83/26987341911.pdf
    • https://kleinimmobiliere.lu/userfiles/files/27265869477.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa05a4a13d---fatolotenojokokiloraraj.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_off0000fcc5.bin
ac3e9b097ad4a6b5840ff9114291b8175540fe545a9552680a7fc7fd707a5f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 17420 bytes
font_01_sfnt_off000129d1.bin
26d1e53f6302ea3989560e80fb642bb0263fe0b5dfc259a81e251a65e4c385a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 10328 bytes
font_02_sfnt_off0001411e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 16792 bytes