Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86096cc9b0d7b76…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 16:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08d32aa8a71c57ffe48f6b6e21be192f SHA-1: d9eeb8275c9b6edda86ab5480e82d3b235a7abd4 SHA-256: b86096cc9b0d7b76f9f105df15da3ee270ff4f0debbb80e37bfc848a32dba1cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7816

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=omegle+video+android+app PDF link annotation
    • https://kaptenhoki.net/contents/files/xidesidulofozokutobabavor.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/30576528494.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142da1aec01c---detaveseneparimotoju.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65035026266.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/bigogivetijinad.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75477960000.pdfIn PDF document text
    • http://jljemc.com/upload/files/gapilojepuwo.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11890291560.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/nubezavotimune.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/94216525019.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/fizuwen.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/kakebag.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/10901158867.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/ketulovizuwex.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/50368772269.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/faburomukig.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133534b31201---82314352036.pdfIn PDF document text
    • http://saimiri.name/upload/file/boxupebozuxajeroma.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161300b2760881---patijijojufe.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/11457563576.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fokunirenupeduwolazo.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133037be10ae---8316947284.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10560 bytes
SHA-256: 25048d165998772c283d44cd612fdbf7ebcc8c8d61f46d576354319e991d147b
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 19852 bytes
SHA-256: 38441ed467880cb29388cf670748309eb4195c64f057af034304b36bbe8dc959

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