Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a9acc667025c75…

MALICIOUS

PDF

82.8 KB Created: 2021-10-08 09:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 847f563a7d936bd6495099d7f82961c4 SHA-1: 082b0a9e799c84a2d6ce45273160e5b63594dfac SHA-256: f5a9acc667025c75b4fb1f5aaee3dab821a3dc0260a9e32cc05d08cbec73b820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aotwcasino.com/ckfinder/userfiles/files/goxatefami.pdf In PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/jotubusak.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nuritali.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e45676bed4---43407756359.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210913154641_wp5pld.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/ruganitagow.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/27968456399.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/firozig.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158256502902---fesezasunimilakowiniruxel.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5e4324cb1---xiwumudenuxesozeveleniv.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b4fb1fa0---madomid.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/15449669243.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/rosanotoveguxunine.pdfIn PDF document text
    • http://immopolignano.lu/images/xosexugapera.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mogofuperonakaxani.pdfIn PDF document text
    • https://mkontakt.com/dat/file/91665136647.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f1ffe9fceb---92411579512.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/28818774886.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d20cdb0---39555569050.pdfIn PDF document text
    • http://handgun.ee/media/file/dobowigirepuber.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/62842117954.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/57698977688.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/lireturipofemipanipudotug.pdfIn PDF document text
    • https://gangnampools.com/contents/files/19896468714.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/vujamobagugemorekosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+on+office+365+wordPDF 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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10804 bytes
SHA-256: 9d26092186532117b217f0a3f7df404793960aa335b895360df122b1fcd27302
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 17384 bytes
SHA-256: 6eef9f7b931b7f5b4f98bcee935e15bccda2db29d3160a75c242ec01cb5e7e29