Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e61b7ead5b0554…

MALICIOUS

PDF

131.3 KB Created: 2021-06-27 12:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dc797e03c3bfd9220b8bb75be03ce6e3 SHA-1: 76ea20a4467ba74d163b6b950e672a9c9e8347c4 SHA-256: 50e61b7ead5b0554bcb6238d00a2444e70aa8a09363c368e066f1afa1b746275
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://soupworld.de/upload/file/rudemekezifaf.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/78db67f2d5c8b37a90de15f2220efed6/pakomijomesebavazefuwi.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/74src8etcf00ceb5oh2lto207e/seguselezepoxibekawosep.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4e8d437169d0a616e4001874ef8143c3/paxiweworagebakosijev.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8ab0182---gudomofifa.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91994188143.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/29230845396.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74d80c16e---gokexeperujafef.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rasapikivasewividifobena.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f2655ef3aa281ce90eddd7f725e18d8f/97348391665.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/dowipebekamoda.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/68757d53d324c266c49fc7d1ec54c674/xoramivosu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p82tvq3bm6omclqq76k1lrqkh1/53381243042.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e9445cd487f955fc7bb0597326f28880/kotugosutumerigaxatudoko.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/jusobapotuwiviwokused.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1e812ffce75ff31d5763ad735f0f4c9b/4779994775.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/dc9212be95c39e55c6aa6a4df576a04e/nuraguj.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba2e25e88---wodagokozupuwokomex.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/firigozikaxuvarek.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/96488649944.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0sg96akbutgsvrtoqjh3nmceh3/nugelotudidokigusado.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6440e4e1---nefijusopafolelevavaf.pdfIn PDF document text
    • http://fabtur.ru/upload/files/96731567867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=volume+of+a+sphere+using+circumferencePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F90 21060 bytes
SHA-256: ec0c832147a265a1df6160da47d32c75846d4ecfa0d88f5b2e27c608815789cb
font_01_sfnt_off0001b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B91C 10900 bytes
SHA-256: f6e55865bcfaa56a0904b4201a2d795e39cb39b774fde630ebcd402c897eea5c
font_02_sfnt_off0001d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D221 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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