Malicious PDF — malware analysis report

Static analysis result for SHA-256 867cbe1b48c17b6b…

MALICIOUS

PDF

99.3 KB Created: 2021-08-10 04:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18ac499ec4d9955fc5becedcfe39433e SHA-1: 0990eecfa43f288ca1ba2e7a4850a0e072a3c9b2 SHA-256: 867cbe1b48c17b6bc8700a59687290e042b22c4932a60747760a30aaa1213daa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic confirms the document's primary function is to lead users to other potentially harmful locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.aluvascientific.com/UserFiles/file/18555403013.pdf In PDF document text
    • http://fini.hu/userfiles/file/zofonujotagulixivixapi.pdfIn PDF document text
    • http://12shio5.com/contents//files/zenifelanopamegi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/9763772227.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4530b1862e75366bd109531b29814ded/dosupatomivopekiv.pdfIn PDF document text
    • http://balone.net/_upload/file///3415288660.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/duwudapibibakaxenevowu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/614f4ef8940db857ea074dd58aa38a9b/91777184723.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/33778526563.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/wazowezigekovuguk.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ponejosupivogewibe.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/34949152088.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e4230bc32---71914325772.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/22537941554.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/22287235014.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/87ktknd0ckjqr0gscvlaclkvu3/bugasu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/66148744164.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beedb6c526d---binabetarotixomega.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c74211b40648b514b3436c293f8529b0/82608550196.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/60560880261.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24699942350.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aura+latente+de+kzarka+bdoPDF 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_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 10352 bytes
SHA-256: 653102b4aed38335568be03f58016da186336bc1826c5d4cea7ce95090494e2e
font_02_sfnt_off00014e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0E 19740 bytes
SHA-256: 3a2fa0cb3bf9913bf76c6fb28bc1b0bab8938821997db788ffccb865b7ca9e64

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