Malicious PDF — malware analysis report

Static analysis result for SHA-256 3353a7ac04db0848…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 02:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d0d645c043598154687dcb6ed2a9076 SHA-1: 7b5c1dcde443b34a43930fb35ff73e81f88c084e SHA-256: 3353a7ac04db0848e34d406160866cc17d5923f86d4a5e1736e83cb621e0ab40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to potentially compromised websites, indicating an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=kamienie+na+szaniec+ksi%C4%85%C5%BCka+online+pdf PDF link annotation
    • http://profil-metall.de/content/uploads/file/17517232366.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f91076ca1---91037231387.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/31429145069.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zudumeboguwufolewumuri.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/filow.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/88461840833.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9e940c85be8e3e37f51a08e581ff965f/42585435635.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77157097118.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/ganuvosuduwitefarosageb.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/52921608366.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/52318615132.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mikiweni.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec408bd7e89---39235131307.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/97666513339.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7afb06ef86818fba7b06bf7028375a6c/61030839246.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75817680518.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/buxokoromomefabaxuzi.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/dobunasop.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/82245089233.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/kidapupenozoruxem.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9ce42788d75bbe739914f594b9cad2ee/22770923028.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/madusajuxeweve.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210824/16298054066982.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 11068 bytes
SHA-256: 46e9d5f985b4d3e55f71bb8451bd105f028e32890823d7b1598ffc97931b2699
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 18692 bytes
SHA-256: 29bbea73a938d28b80cd67a86f3ec0cc3aac06682262e1d39cf988bffceb8993
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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