Malicious PDF — malware analysis report

Static analysis result for SHA-256 476f308548b409bc…

MALICIOUS

PDF

59.6 KB Created: 2021-09-26 22:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eb170d940752784e112e6d94a1fcca6 SHA-1: 73c230c844e024656ab98f982cbed7ffb5b7f405 SHA-256: 476f308548b409bcc624f19d7999a87118c42b88ba9ac78f85c86180cd0c121c
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links, including those with UTM parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4971

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=live+telecast+tamil+movie+watch+online PDF link annotation
    • https://get-insurance.in/ckfinder/userfiles/files/8801705364.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5142ac805---96484081098.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-25/20210925102802121397.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/21595506105.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210918_103229.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/98764111324.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/090053306334.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/56834454836.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/72091486621.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/lagivuruwekazujerij.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/matalikumukedumilob.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/dujawazejegokotuzew.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c7fbcace---sesozuwux.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/89284028000.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614decc1bd22b---61505486689.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/49520967654.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/nozosegiwabifizosod.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210914_A5A668CD369812E7.pdfIn PDF document text
    • http://dges.in/userfiles/file/7378004519.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/jokobapukoxawaxibij.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/90164906614.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wisog.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/10011084615.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/rebotaki.pdfIn PDF document text
    • https://arerp.kr/data/file///96147486537.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 10504 bytes
SHA-256: 93ffb3129ba20f3851cd2e765e5bbb7450248172693288a5fd9185c5960172f8

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