Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b20567a58bef4f5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 14:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0db1603db496de60b2e10e834b112a05 SHA-1: 35ae7264ffb0cf5c2eb407d2a1733940b44c1a53 SHA-256: 5b20567a58bef4f59e467d86ddc97539bf3125ef38497eb7232ef9ca68fc6a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the structure suggests it may leverage PDF's scripting capabilities to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://tsnpharma.com/upload/files/libavike.pdf In PDF document text
    • http://eko-gospodarstwo.eu/files/file/jepegonivefalog.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011bfb44ce---poles.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kekimimiramikimarav.pdfIn PDF document text
    • http://thepducphat.com/upload/files/59631107695.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/ximegilo.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/69331947424.pdfIn PDF document text
    • http://benrassam.com/uploads/files/22870055690.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/3281543705.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29556b19e---74582970469.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff28058fd1---risekonuxavasuz.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96236904202.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/37996965689.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/xiwirowuwanajubibesomu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/48045441730.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kiruwixadonuvonemif.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/vozijozabe.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/fasarumi.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kudajaremapavenufosiz.pdfIn PDF document text
    • http://klhl.com/userfiles/file/20364201715.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/warutegobususirixopipova.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sogodux.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/punudidatipewajomamuwe.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/35033828321.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/mafawevuje.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xemugawenufataxodotarikol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+clear+phone+cachePDF 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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 17000 bytes
SHA-256: f275399430d915e92b3c486d3da693a582438686da0aea9b48af2b64aec639aa
font_02_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 10420 bytes
SHA-256: 2229ec6e2d2b6de1db372320a4a0c69dc5186fd92c73666ffe76e3782bf63d2d

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