Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68de9b2d56d8329…

MALICIOUS

PDF

209.4 KB Created: 2021-06-27 15:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd378357c3ccafc5c9033fdaeeb66607 SHA-1: 8f18be479af6ce28f02310c3ffeae3390966023a SHA-256: b68de9b2d56d832905766c3c7a8458e62b98424d588f7bfe34772ce14481920c
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristics suggest it uses a link farm pointing to compromised WordPress uploads and an SEO redirector, likely to disguise the true destination. The presence of a 'Password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9145

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810763bc2cf---53670330172.pdf In PDF document text
    • https://vibangnhadat.com/uploads/files/boveguxejebug.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fa6a53aa---nasamikobobuwomaxalugag.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dp61farup1nar0hcal23jgnjp5/senafajidu.pdfIn PDF document text
    • http://renovator.cz/files/file/mesawisugejujumaf.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082353cbfc37---zevibige.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906934ca212---zixijegow.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c7120dc67346a85b917a2f92731f4468/58788995293.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/72697885028.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rrb6i7tm4it06qn6npu26j44b5/jupinufil.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5f0184617ead49e8e94d519b18b21adb/rurisutajixamalulebate.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9089504b03f8046caeaf3a88db372485/26849483309.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e6c0d10a9504a14603903abcde355153/gipamad.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cce6ce7b589---66100875835.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/97237937684.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/88854983419.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210618_114613.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4c68f81c---wabudamuxolokosorawim.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9a496e9d---pigub.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/67597341300.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/44940774583.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jojutegujovodokanod.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=physics+for+scientists+and+engineers+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0002cc16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CC16 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_00_sfnt_off0002b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2FC 10912 bytes
SHA-256: 5a99eb294356a60aac9e53ebd4e49acad27d7210d009c86d08e0ed6895eb6a7e
font_02_sfnt_off0002ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF05 18348 bytes
SHA-256: cb0e1634ca0ee4b19a35a8e95cab0a99bc7d047dc80938f0a7e0ce2851d3c723
font_03_sfnt_off00031d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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