Malicious PDF — malware analysis report

Static analysis result for SHA-256 80379d344fe29842…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 19:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a28ee5598fed846f453c6ad1dd8faa1 SHA-1: aba2ee08228f587fd4eef47cf98c83d9fca6d67e SHA-256: 80379d344fe298421ce99c0f2d52833605571efef30a32c53c6ccb874e41185b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using numerous links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=kuriyan+jawan+bapu+pareshan+full+movie+download PDF link annotation
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/tuwarolafepelof.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/gutakasiwuv.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8p14l8buir3t9rsrm2f8befrki/65139631711.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/fazeburifalawefakegated.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11245040217.pdfIn PDF document text
    • http://video-cycling.de/files/file/godolezunupisakot.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/75816886526.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/83283517673.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909165823.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133025408990---rodobupikifopujujezafijun.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/5301491259.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kekasolonenuwi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4830a7bac---nijimukiwakaxi.pdfIn PDF document text
    • http://usateatop.com/_upload/files/fulomaxeguw.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/82498559275.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/weroxegipunopuwogureban.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/93667017974.pdfIn PDF document text
    • http://www.pilartangguh.com/file/vawisegivejupaxaleros.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/45151897415.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gezokuzexaluvuletijid.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613508a77e2b3---61778945865.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/vojuzizijezejuvilenike.pdfIn PDF document text
    • 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_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 17624 bytes
SHA-256: ff9c8ccb8e744edf5b2f4f8b3ae2d5d8ebd3698ddfbc15555eba21d97f1a180e
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 11292 bytes
SHA-256: 15b57fd478e5e270b0a61d8c16f5f0b47dd0c92534c80e3d27c673fe0f74dd55