Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e313a6a49f876ae…

MALICIOUS

PDF

108.1 KB Created: 2021-07-15 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06eae12baf5686815c8d2d467e4d3a0a SHA-1: 5df006c5b9224bbea166f993b7da765f420aaed7 SHA-256: 7e313a6a49f876ae114d1611828817595308de591c8f5b04ec3fd0055b5977bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=amide+and+imide PDF link annotation
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ef85e55f2b7fea3116da5c8930e24119/45119947335.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848ca69163b---xixesijojelegigipuxozomi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bt7nu95t0hpec7gp6mpb1pudv7/sufexa.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/22705746410.pdfIn PDF document text
    • http://talleresjpg.es/img/file/65270598102.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/podavu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085942c1f714---lutepolosowatiwakijokopi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/14rv03mk2egeosb83fs5jo7ir5/70402448140.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/79560337088.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6k645jfr1bc16it5kloumbqkj0/vumugefado.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/59481307290.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084e67d1a32a---lajeruxurom.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/caf5q4860uoblkrirbq3ragotl/7215266754.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/2gcmjcjra5opft0qtio0urmupn/mimapewikole.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jepubiwizumife.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/29173196815.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c295d390eb4f8a26dd10dd44d83a762/bagopojudufuzewaxada.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160709704cafb2---sirokipiwobokolir.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e3f5210a1d2af6b81634d56c9593504/rutigakazezineduwogijekun.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sbirr54dasbebil8nkh38t9t3b/28519504032.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1dde15625ac77cd998e0429e6c8f280a/naseta.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/39278007479.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zifazopumi.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_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 9856 bytes
SHA-256: 40e3b58f9bbde83708d7663e65628b29a1173a58f53d547bbe76d8b4070375a7
font_01_sfnt_off0001581a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001702c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1702C 19240 bytes
SHA-256: 4468c4c9163e9447e9c071f4bc7d2845b5a236730bf42684ae8de2403005c3bf