Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc0097b5360ea2a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4970d4ecfcc5205567655bf21699372 SHA-1: 6efc46a14eee02c7f231160db5ff653307d83376 SHA-256: 1dc0097b5360ea2ac5c3a2b4681a133e63994180caab321a874c562866da8920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing lures or directing users to malicious content. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=fish+nematodes+pdf PDF link annotation
    • http://www.deewanalarab.com/up_imgs/relupojutenob.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c3d041f36c878e31dc5e0c2b823f6e37/86568876320.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d1ee61c28---52406284442.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5632658bf---raloderagizujogedi.pdfIn PDF document text
    • http://pvvc.cz/files/monadisagaje.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b3aac75e---suvezopi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/02bf2cdf7f6f1d859f06c9dfdda4e9b7/64487986754.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a9899c7e8295546333c08654b4f02835/povewomifejumijeku.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mujaxezopijajup.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/jpbdu31fpnrdsm89mnuphfdc20/1107086982.pdfIn PDF document text
    • http://fittbike.hu/files/file/62875124728.pdfIn PDF document text
    • https://riwg.in/userfiles/file/40217203719.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/4448455037.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d473d4de5---39295991720.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/mepob.pdfIn PDF document text
    • http://3sdent.com/upload/files/jifonubatazeniz.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/16635550213.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/50447521845.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/52366846119.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/71873957546.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/5524412405.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/88409229394.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lrdqch3emcjalqf13b337oi7ub/89577649057.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1473af553---30511096026.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a0gpd51b94etf579rv5367uln1/pivujevexawozaluxekog.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_off0000c3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 10592 bytes
SHA-256: d8376b8fede3cdb47da10ebc041260bc21363a4459e4c8ba17ab270d96914be9
font_01_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 16736 bytes
SHA-256: 068e343b669611a4695a3630b610131c2631f2a490b1ab6e98e90dc04a0dfe7e
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1