Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc80adb1a279d3b9…

MALICIOUS

PDF

121.2 KB Created: 2021-06-09 10:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 58533f8a364effd95b4b02388595d69f SHA-1: 873ce68395f9ec6b484da6a4d2e96c057babd7a7 SHA-256: cc80adb1a279d3b9073e28a2ee3c8e45365675e89be0710b5570080a74e3feca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nomylo.ru/uplcv?utm_term=kannada+poli+kate PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b350c3d0---63437979598.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608193b715774---sobegevifapul.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b1e37930---duguxodifununapal.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uaeb9ngmolc7takic3qin5l7s0/23979825661.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eb3b5ac3---jizoko.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6b55a42d457a390378d67396c4ba1855/72647453832.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6d857f33---dupefumawusefid.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4t1o8u2ettkqhmpsb71emscaj/72131787176.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fft8vt56qab9p5b5s6u8m9uck5/45712107208.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/16668e2694f6169cbbc504a4f00f6d58/robukoxaja.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/80f1cq7toqu9bllfs73me2akos/fozad.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/42409108664.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/21708180133.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0qsgkgpala17gg3eh6jcuclup5/12351371012.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5eb456a3---vikutefevunaropulipedugaw.pdfIn PDF document text
    • http://fygl.net/uploads/file/250605213917.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/tilade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001921d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1921D 4500 bytes
SHA-256: 71ae785b54e357f144626c0af3a9581c94b2fa5b2cd790668f90dedd746d5fc7
font_01_sfnt_off0001a171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A171 11748 bytes
SHA-256: 632a5e0ea76dd2aa880b76b3e89f5df8489f028a6ce4e51ec9c9dd6cdd17d182
font_02_sfnt_off0001c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C868 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e