Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaee8478ff54979…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 04:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa0a0ae17aafbfae74a9daa40c393454 SHA-1: d3f3d7e0a882fe7ec105e48141521ae5d5e59186 SHA-256: 9eaee8478ff54979ce1e789b1d12398ce35ecebe486dad0787804d2c48e8a2f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious campaigns.

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://ketchas.ru/uplcv?utm_term=watch+sword+art+online+english PDF link annotation
    • http://kronospan-mofa.hu/editor_up/xegotijexugod.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/52998820430.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/25017137146.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210910125153_kmv8so.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e0e4492e---gajusebidub.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e079f3b6f78db788200cb580bc2ff9f0/luzepubojenaxi.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/mewudidigaw.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/9596357889.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pikenijalivoxududuwopiwed.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/82968410758.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/98189396509.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/bupen.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/6802989545.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/zibetinanosajonub.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/71708636153.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/13389269857.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/71121308195.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wusexuxoxakitonamoragapu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/31681785127.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/fuvazotakojipebagavu.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912000651.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/webijaxel.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/fufininepe.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jenituxafopujewumu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/borokibajepanizowojuvobub.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f5aee1cb0bab17163013f338782274ec/gilidekuwojiganabosudom.pdfIn PDF document text
    • http://soupworld.de/upload/file/pakadapufan.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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 18304 bytes
SHA-256: 7c4233e185ac5fca1432d237620d8f27222c1549d1e484a4e8811e6bc281d5b8
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 10728 bytes
SHA-256: 1b9b62b4b59b18eafccbbcf1e9b6def3c89c880d246a4c76788d482b4a3e3a3e