Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc55d3bcd67578d…

MALICIOUS

PDF

82.7 KB Created: 2021-08-28 12:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e222989971b8e794f574d95f2d98905b SHA-1: 3ee270159b408e407830f8826a12f2d7d5c65fd0 SHA-256: adc55d3bcd67578de26dcf0682c7eb07b6cfaecc90784ba8149efa4612ac796e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=what+to+study+to+become+psychologist PDF link annotation
    • http://w-f-l.de/user_img/file/50191521789.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/jisaluzanefafepibegudo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de0b90906---madorosuxedafuna.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/xejoferonavepixogenos.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/6005627836.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/donajezekulebe.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/78750819761.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/pofuloj.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/18138743201.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3tovma4t8g3d9u3do42bkbrhjc/23009833818.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/05c3554626af8b04ca53324903eeac87/28462421144.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/jaderorif.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cec03bc---vazezipate.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/vedapases.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/33408111850.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dekobapajor.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/061ah2cleqil3kscdkoah744j7/supozol.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/bonagubumepudu.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/paxinumejikefonagad.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21f62d8bf---63012263334.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/63603869153.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 17288 bytes
SHA-256: 77d080065ba601dde3cc5d059c804c8e3df52ff9b269ef585bddab27494387f2
font_01_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 11104 bytes
SHA-256: 3db0a2223a9e9c7d862782c312b03903de57f66533cd11a83e163581d6735ac6

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