Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd3577df24c3c1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 08:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fcb58e6ea2b63a1073b7da447746b9e9 SHA-1: d08c5230515b5c96888cb17dac39982db3969074 SHA-256: 67dd3577df24c3c17579efd90be061331fcce33cb67c341f8ca021beec77f57c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a Trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing sites or download further malware. The presence of multiple links on disposable or compromised hosting reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alasclub.gr/neuro/ckfinder/userfiles/files/97717598461.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/121u672fq954k4prd7kut1tl07/29420323862.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab5d54777---zuwikegemuwikulolelonusu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a86d6d34273276e260360e9a3421e913/98905043537.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7b68823f908d53d7b32a676f19be923d/13445319980.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624420355.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e8bd572d6---kijanebuvuwuxotebewu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53091101364.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/boxenudo.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/tiluvetoxunitufavirunonu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c337cea1---61353306683.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/92086967434.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4298e5f8825aa15fc8e05d8aa0cbc26e/jojovafuwabis.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb49fba5---motulexarenipuv.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pot0trlle8nsc5hdvopcdlrul4/53753570766.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/84314756530.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087575d10068---paxebavagimuma.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h21lnto5asf026vrtrf2mjvc3m/tatumurinumigide.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b2630e575a8b31a61924f7587a4dc50b/12561768785.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/vuwolajasozu.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/99273680335.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e2238b86---fadegerumekafa.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/91975998701.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/wikanokoganejenaratuzelu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tclhqj3j13etsfovfqj39liag1/97861189860.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/zodinilofewegotejiresa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shirley+temple+cocktailPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10648 bytes
SHA-256: c58eabc2652b81315c9edf029bf1f5a795abf2c077bc2906a5b77cd30027b0ff
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 18044 bytes
SHA-256: c299505c5f3d286f4e6962919ca022472e15a77df1d96fb361dc8076cd914798
font_02_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1