Malicious PDF — malware analysis report

Static analysis result for SHA-256 a637fdc93996f95f…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 09:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d095cb208451520ea9f9b91cb20c2a42 SHA-1: a4d64ca1b042ce94f2eff19b7964b73a2aacbc63 SHA-256: a637fdc93996f95f9c12eb80cd406ffaebdd8037c98b52f081528811a8f760d0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the high ML score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=petals+on+the+wind+full+movie+free PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0536442ef61c2d28eced4669cb5abe4d/9282271780.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617ab0d171---jutovemuzizoni.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099861d7eea3---volerejuw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c3153337---26496535186.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a275df8be85ebf6eb67f9f8de2d1ce5b/bikakukojimidemalemam.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/88924698413.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/setixuvetelebujojanider.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19393251222.pdfIn PDF document text
    • http://pololanna.com/user_img/files/taxeminepapunuvesolunuxol.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/selojefezazukigilasewixe.pdfIn PDF document text
    • https://media-get.com/userfiles/files/64849412007.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35fa3c3d---mamifasozefeposixovego.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/piwij.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65010bfd8e98dcdba75ec75525304389/vorudumureriw.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/70771971308.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085947b7eef2---tejuvugadis.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gotewizoneb.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b928b6967---paduwerekizaxub.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/6340356911.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f5f2222---83589327576.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ab2d015f8ce3c1e8b846db9391a90e55/gabolaviwijunujanaxif.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/20521653069.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_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10872 bytes
SHA-256: b69cf384773dc88064c1fca79dc2cb07fd9ea3a3c4d97ca5daff158659eedcc7
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 17604 bytes
SHA-256: a7d98a94ace43197586192af19669d3e86d847a2268c00985297c1f0f0ab7f48
font_02_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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