Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9167b6afa0dc47…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ad1d9b6bb9f1d9abdeada99280e09eb SHA-1: 09fc4e48cb0a383716b849f0403d051eece34a8f SHA-256: 4f9167b6afa0dc478cc4e06db81fb1daed8e716110b604c8cafe6e9e8cda30eb
176 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 websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://bedrucken24.de/userfiles/file/peremimoseniju.pdf In PDF document text
    • http://gancza.pl/userfiles/file/55629126772.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338034dc34b---vefava.pdfIn PDF document text
    • http://cartopack.com/Images/file/9651688369.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/83064008511.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/kowolofasodikabisanesev.pdfIn PDF document text
    • http://agama-rc.com/upload/files/piparimowiwekomixepefunor.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/tudufuwupifanotitaruner.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xulipukuwirukinun.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/ditatuduvukekof.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/daselafinejerapezodawewo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/54058974483.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/tusuxonapizabodazedi.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/tinodumixipopagusesareton.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/tinelifuduwilokatuf.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dre6kvc1jt7gvvucukg8l08l15/71799473772.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/fefamidimegiwofe.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/wenepafige.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/87815973921.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nelikezamewufuxe.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/84745679973.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98cd1ef2---somira.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/9827847852.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/164896712613c68900b356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+scan+wifi+qr+codePDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10536 bytes
SHA-256: d20bf822f8e4ece4a6f564c50bbc957345fae3989eaa3afdb1feb3bf565ca320
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 17904 bytes
SHA-256: 0a673b024f8d626752883f5ad0110b2811e290c2ac00db37bbc16a564a9729d4
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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