Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3dbccbf9f0f0cb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 09:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fca7db5204e7939b7fdb23ebe565429 SHA-1: fd0b29eea7da15d5c7bf6090ab370eb4cb58b1fc SHA-256: 0b3dbccbf9f0f0cb58949c8117dd01a2fd6bbfbeedc73bb3e195eea9a13c1a7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=can+i+connect+my+phone PDF link annotation
    • http://humidorio.de/ckfinder/userfiles/files/51181977823.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/17394819560.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jimagogikajetogep.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xopowobafonoxusawofuwav.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309283c7349---76306350738.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/86676379984.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/36490482354.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/68164271552.pdfIn PDF document text
    • http://happy-land.hu/editor_up/60589792237.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210903113856.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/89011652110.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/9415009957.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/63831130844.pdfIn PDF document text
    • http://machin.kr/userData/board/file/66786791821.pdfIn PDF document text
    • http://wych123.com/upload/files/pipetajitolelofuxiva.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kojezelokekad.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec845ccc96---mibiluguwejodiwuvo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613432a2f03cc---21218247209.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/samofekuzikusezif.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/roturorujopoxasabifovebox.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613327ba33633---59486410184.pdfIn PDF document text
    • https://polytex.de/sites/default/files/40562567472.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51dc0ce52---sejumuturavubiwo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395b7a0947f---vezosotetixakub.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/50814885998.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 17108 bytes
SHA-256: 65ab2245f31ca1c080b239bf8d2cb24377fad5f9915b3015a36d5e935f6b7ff9
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10472 bytes
SHA-256: e4d8c9626240733d2cd8d6924b1ef09e0aaa3dc93ef8f93bbedbaad5d9c4a060
font_02_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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