Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adf7a8519132de1…

MALICIOUS

PDF

92.6 KB Created: 2021-06-25 23:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ca1b88a6c745af3c2b5b78d39d89d41 SHA-1: 3cf86b21cf3050692d01238c82b53ba215d3cc2e SHA-256: 3adf7a8519132de1715e32f1b40b802aac13d4bf15b6eb7d8960012ed2be581d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d698bc96e2---45336604484.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/iuqm3ddpq5lutu3eui4163drtb/budajedexelo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f5bd672f57944f3934094734422c37e/45549897537.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f5icg0u7pogdf7l68tltujadq3/marijizutiwafaz.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9f376ba8e71cbee799f5d329d0ed2fb/16618833475.pdf
    • https://irantruck.ir/data/file/xusopikojojusakir.pdf
    • http://maduraigarlandshop.com/userfiles/file/36036407114.pdf
    • http://builderall.info/userfiles/file/27231772037.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/05f09126cf312d99605cef41150fdc39/minokozopedumibonoxedoge.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dff908ef0b1675ddf1ee40c816291b30/gidivazatawexadenipud.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89fc1bffb---sirabegoxirekazesoniz.pdf
    • http://dailyxedayhang.com/userfiles/files/33341931479.pdf
    • http://sacoorhealth.pt/site/upload/file/zijidozatimakutomivete.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f5ikvsr3n5v70g3ahfb9jcqb0q/zovibelesifojalobafovafo.pdf
    • https://cakenepal.com/userfiles/file/tezuzigotufufusopom.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88a2987b5---20831705113.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcf81d7c39---rimevojofubitasegabeperan.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c81535b00---97286992248.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e7200c919---dowazesutopukamozosetoj.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3lgp7nktqmf7el2mmo4kgutdf2/puxubaret.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db95b083be---12876282635.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c1f1aqu58pl9ep746287iccmt1/29316837874.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/73960287733.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hawaiian+cleaner+wrasse+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
font_01_sfnt_off00011f00.bin
42d4c89a8e8cd1be64e4c77bfa341a834a77ec940600199be0532fdcef8a274e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10308 bytes
font_02_sfnt_off0001365b.bin
820c6321bf4c82a6eeaedc67cf743122308ab4f1f890d781e5070bc9d42db869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 17232 bytes

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