Malicious PDF — malware analysis report

Static analysis result for SHA-256 674dc20d708a0c1e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 10:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f90162ae828512359ce327873de1a60 SHA-1: 859f6294a3ec6a7e0fe26dd90dd1e7c0619672ef SHA-256: 674dc20d708a0c1e20300feef48c2e61e92d5bb8238e69a29452a30565a49982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070779288aa4---viwuluwubofenuj.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d10b08be9---refuxomumiparef.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/pawesodipixaxifizusivuzo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082500e48169---26801962517.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/41149548832.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b430b1756d---kuwofudunu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85718aafccddc5dfc8b1c22ea75cf05c/nanasusavirorukokijosu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff08f312bb---88745298386.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052109555151.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ac87cb8c42781f417d843d317a69dea3/xibibumuwulawajugepi.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/32530700886.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/nifenuratizexaxakutetuw.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/34840123922.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd872a0e0e---9764294268.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e8dc2cd1d22061a190ffaffafb838cac/lotabejobonuzagozibuwad.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8tq3h6rlualvdh57484onv49uc/24257679267.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/sodobapinijav.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/sufovo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdec71b6a59---gifufasiridalawifezizimel.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/38056689133.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d939bf8aaf9653fc1dec91bc1541169e/losenabefotomoji.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/zevimetedatuze.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d049e8b61---duzepalenuliduzudukage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hydrocarbures+exercices+corrig%C3%A9s+pdfPDF 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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 20016 bytes
SHA-256: 5c76a8680a625a72368709682347b67653d48974b87140e324d8b35766cdba2b
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 11148 bytes
SHA-256: da1bea9468933bc5abdb0678cd38b7fd346fcedb59a74add3cdd1c5be9a010d1
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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