Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd619882d3f8a89b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 08:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e62f94385984e48abc39b71200a7bcb4 SHA-1: d2c5c782491ccf95849be81e41563b2ccceff730 SHA-256: cd619882d3f8a89beeea1a6eb453b0a8ae1dc4d6c09b4a56564d2cbe1c20067f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, indicative of a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=lucky+patcher+dragon+city PDF link annotation
    • http://saddabro.com/userfiles/file/93178226385.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf889695a1---bukedita.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/6644952810.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/putepelekogudobonotu.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/keliwivu.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/34828079628.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62ae49e14---92869341053.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/fupozopefowevovexe.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/doparerojenagetofo.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/93792657378.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/32418525083.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/70168958166.pdfIn PDF document text
    • http://full814.com/upload/files/nenekigaviwugadiv.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zoxabor.pdfIn PDF document text
    • https://csodamalom.hu/files/files/46636302947.pdfIn PDF document text
    • http://roocenter.ru/upload/file/93616190172.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/saseludifudigaregevix.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/44137048674.pdfIn PDF document text
    • https://artenika.pl/fck/file/kirusixirereb.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3ubkmal4ep9bvvpkdkf13v98tt/68485270728.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210911191611.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/degubawuviwepubumibi.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_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10844 bytes
SHA-256: f5094390ac13294277df270a3a72a09d6c86eca6ac08454d2831c85b12146b27
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 22052 bytes
SHA-256: bfc0c6b3075263d33e24cacabe8dc26665eb7967358b10dd8f08eb9255aa5ff6