Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b87c4f92b34555a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 12:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04dd43cef2f7cbc9079564a36378f5f5 SHA-1: b5fbbfd04401de0779fa8db7abacc40b66c25351 SHA-256: 5b87c4f92b34555a50ed8251ee98419fd0a097070e6f205fdefce1406b2dc0d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards the T1566.001 (Spearphishing Attachment) technique, as this is a common delivery method for such documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=the+tudors+james+frain PDF link annotation
    • http://bptramptour.pl/files/file/27289807768.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/67940587553.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xuponedisutipokar.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/87414213843.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/rufumube.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/74227069438.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/24780817542.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bb0bea0f2158a5fc4dae40536037313/lotuvex.pdfIn PDF document text
    • http://ipllaser.in/uploads/zavojeg.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/70561112684.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb7fd4b4f---99954301880.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/87606718838.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/37005064033.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/jefovole.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/84926801560.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/kunezodi.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zapesi.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916153626.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b97add602ddad747cfaa8b9df6fef00f/1168884054.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/94663526338.pdfIn PDF document text
    • http://silver1979.com/upload/file/23000106458.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 16088 bytes
SHA-256: e431d1ebc381dd1c0bef6f27319af7c1ecb709cb9b9ec8d7cb190c9fc311a1be
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 10764 bytes
SHA-256: 156f30f42130a91070a4f3cbc8be043fb5e60497c0a3cfe0bea7a7ce0dff3f63
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1