Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce3c510ffdd4ce2…

MALICIOUS

PDF

64.5 KB Created: 2021-06-20 09:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 987247c980881ad57ef226397d31d0d5 SHA-1: ba7c3910c46d7f4352300ab5915b88ecac2f3074 SHA-256: 7ce3c510ffdd4ce28bea38dec7326c862f87e661d0cd78c444d3044b71cc8260
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of a 'naked pictures of old grannies' UTM term suggests a lure for adult-themed phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=naked+pictures+of+old+grannies PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b7aa5719e2025398f9e93ff51a28dae8/45227770497.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/puco05ptqap1vahe5c7hjlbc44/sipubupuragejevogoliki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082cac9d8f96---fezikunoribowapi.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/18461223484.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/tibajegetubugego.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/joletutobugijugaxur.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075324ca1f52---85241464906.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b0ac45a---36210731361.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/80bc9c599d2c9e872fe7633daec50734/koxix.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/j6jf5p5gr1djkisfc114ald3b6/96786907329.pdfIn PDF document text
    • https://appfacile.it/file/54217712968.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/52947607579.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428cb57fe1---97687107183.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f4b092f56decb66b887c45ea2ddd0b1/98537574440.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d48a5770dab70532504c6e862781cc3a/12129426566.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13b8b7bbd---32437909268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 5356 bytes
SHA-256: 3eb787c2ac7f71a17e8714e851a09199f668980c1d00ba8f641d888d3bba88fb
font_01_sfnt_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 10672 bytes
SHA-256: eb8ea381d72e89fc8c0e715c21255a812fc996ae386ffc8391e04b5da5a7f8f8