Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a06df9e625c23b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 16:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8df356d2973585d263f8c7acfcea18d SHA-1: 4cc9989571cbc93a02e68250d858ef56a6432115 SHA-256: 86a06df9e625c23b2072cfa1c6bba640f8dd187985c06738214f2cc752c4813a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a phishing or malicious content delivery vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=fifty+shades+darker+1080p+download PDF link annotation
    • http://rapabzenec.cz/obrazky/files/69265336857.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/juworeziral.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fovefiv.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/palabonopozilatimuxu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/57340075453.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0e0c73600f82f0e0f6cae0bcaa83b910/wazokexanad.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/49107556460.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/9890689311.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fudusiwedugozibukame.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919141525329519.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/taratonujekujufirezebize.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/jereveremu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/59627788746.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6afbj0phagcl0jbgp03n1a44k7/19086795139.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/7634302955.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mazosiwesekeje.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/39139569193.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/mitejedamawugarisow.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424714108c5---nutikepoleme.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/buzon.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lawusawefejexofiwexefel.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/45891860720.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/77233681555.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/vasosojobatogekofobin.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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 17656 bytes
SHA-256: fcddedfbe6d359a411e9b1b4a46b25cfa049985299fc11a82be5e366050c8374
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 11248 bytes
SHA-256: 8685f3ba62ae47d5b537b489a4faab9bcabc2af1ea86bf925af0bce438fd5070

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