Malicious PDF — malware analysis report

Static analysis result for SHA-256 034f0af6a4b66317…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 06:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f7d589ac8132d083b5b03fc2f42ef3b SHA-1: b761c415c19dcb2c311a6e00d7c654add111dd35 SHA-256: 034f0af6a4b6631784ae1f13154d1131041f93836beb849912bb856030244bb9
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=what+is+app+crash+in+android PDF link annotation
    • http://taxfreepoint.com/file/80046059789.pdfIn PDF document text
    • https://coil.hk/upload/files/26795591204.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524ca446621---83237430299.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/tuzizidasigagasud.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210919170528_1582539708.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/64573444914.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/90091569894.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_095145.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/zukimirujuzugatine.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/75177717079.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/xulowugivodaxajis.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/difadusakodubeba.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161524c8ede73c---runakomufovozanifetemurut.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vs2epgg0mcqibpan9fejoig9e7/74938149704.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/75760370148.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e301059284---11436029082.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/48682036161.pdfIn PDF document text
    • http://podarox.ru/public/files/84761596333.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/8864815807.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/tiriwezago.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/xitivadibefixubovep.pdfIn PDF document text
    • http://www.heksan.com.pl/file/99741732730.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/tizarulelaxik.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/45845884234.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39787359349.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tuzud.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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 16812 bytes
SHA-256: 6c2e054011458e7225ac0888171e7b05138211cf55fa7fc4950397f2914b56d4
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10428 bytes
SHA-256: 22dc6afae90ece45b2521a2566518ca20e846c5f6a3f8473ae08f802446f4624
font_02_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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