Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5357c1e05ab3dec…

MALICIOUS

PDF

90.0 KB Created: 2021-08-26 11:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6772ed8cd9603e57e57554928dc31656 SHA-1: bacdfa17e526c9f70102ace0b6552834b62c4e24 SHA-256: b5357c1e05ab3dec234dc12f4e3d9881fa239caff9664494627e34115ba075fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kasargod.net/uploads/file/mopevek.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9294cb674f---bawuwogagu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/naruz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da48880569---kerowodabedov.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac79311812---26873391737.pdfPDF link annotation
    • http://lokalizacja-gps.pl/userfiles/file/vusubafe.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a649e3748ae---wojorojorarejijer.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sefek.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/zamulose.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3ri0h74ov3ft4h07navb5ta063/mugibexe.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/mogukiwirof.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8369ae9ec4---79559710153.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/82283edafba073b0754bee579f66c317/nerevawuwitarizusojakox.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e05f797b93---2392694303.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fc736df030c94ae2562c0c2534726958/xasijatofexufemokixamow.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/67550812778.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vosebobekokexa.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lagitexidatizemep.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/99765616860.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/55164847428.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/75403266698.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/90828358389.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161109c4bcc45e---21398956539.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jplh1kgk49vnedk11e1io9g7vh/70086196591.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/8063441208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=giethoorn+in+hollandPDF 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_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 18812 bytes
SHA-256: 3d23932db334190650dcc94ac81048d7c9978a906acad38d7d4410b025d6a8e3
font_02_sfnt_off00014166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 10216 bytes
SHA-256: 0fb4aa26082dd5c04999f02af323bd6970523770906144e333dafba5eab91da9