Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be3cdfe4c4bd71c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 23:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cf05521c08f5d3fe0d1c7aba1613187 SHA-1: 57b21e7eccaa385fa18a0b8bced281cf0ac43aac SHA-256: 5be3cdfe4c4bd71c29262b98aa4d21454ed7b6c663570802487d68b04d1697f8
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting the user to download a secondary payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=american+english+file+3+pdf+download PDF link annotation
    • https://vvpta-irvine.org/userfiles/file/jemutal.pdfIn PDF document text
    • http://benrassam.com/uploads/files/56422094700.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/gibudowuluzugemokanixamu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fbespicifl6tftdt2f1add1rj/33642302658.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/vilusarazabamesuroviw.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/sepofukidilokatisuxubexul.pdfIn PDF document text
    • http://1careglobal.com/upload/files/4393823699.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/jonixosufiwi.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/waxoba.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/83830463938.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/rapepovurezivev.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/77206668411.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/texugudozitasokenakev.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e2da4b204c40514711e65fe743cc8ab2/61619969683.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407aea1ec9f---87201574089.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/nijogikobugituzo.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/pikedafataxafufedegas.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/9178156370.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/95671106082.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/gezoko.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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 21612 bytes
SHA-256: bad0f374d9e12162f767b4aad3c8d9aebca30fe4102d23735ab43280cf50d860
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 11208 bytes
SHA-256: e970461903566b77abca3f0064fe30f2b81bb9e5e34286426d4f96ea7fcc8ecc

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