Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74ac1a59f429395…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 17:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93c8ab90911ca1f08317e74bfbd5de3c SHA-1: bcee65be3c7dce565eec836cb81f6ced86589dab SHA-256: b74ac1a59f429395134dcbfc23a972b1b12b1d2fb5bade6a709a1b47c5880e1a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download other PDF files hosted on compromised WordPress sites and disposable hosting. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern. Although no scripts were directly extracted, the overall structure and URL distribution suggest a downloader or redirector mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=converter+xml+em+pdf+programa PDF link annotation
    • https://heritagecambodiatravel.com/userfiles/file/72084529306.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/loxadizobivilun.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/zagizomevataneboluxenizel.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/pofom.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c9547fd60---zawexa.pdfIn PDF document text
    • http://aplus.to/userfiles/file/wajeroseri.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eefdf10c6---14437578531.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c94m8p458mvrh47jqokm9ou055/rexurebederuvesij.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fe3c230335b5d9536ba604a236cf8e29/84038885018.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/44670988106.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zuxedal.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6d54783d---ziweveki.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/72066026877.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec698cc09532ef631ca08aad7e22aa18/bilamikuboxafar.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/66266926061.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/92141508702.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61c0af737---45930243872.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607977278a48a---74170042222.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/seditujem.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/67509181830.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/34537349794.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/69864109408.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a17cf412cff0773ce99a812672d39179/baxoxa.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/kazubafebisege.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610999f33f2a7---49427184355.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10780 bytes
SHA-256: 164d6a5b633330132c57e02240e54a499faf1a2f9a186cb930cdb1681078aace
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 17308 bytes
SHA-256: 0b359cc1bcc1fb211f891b090ede9331f7c9192e95406980912750004902cb36
font_02_sfnt_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1