Malicious PDF — malware analysis report

Static analysis result for SHA-256 27908145a0d051e6…

MALICIOUS

PDF

176.3 KB Created: 2021-07-01 21:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e3776f58ac65fbba9af4d01863b2276 SHA-1: 7c445d3aabc3eb5c28a2bf08522f2c1d45e389e8 SHA-256: 27908145a0d051e68fe6c75ebccf861010f170b8a0718f657a618552df9cc144
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as Pdf.Phishing.Trojan. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://asfus.net/virgsurv/userfiles/file/84098019870.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/732821a6e31a910627cd3977e7baca3e/kidoxotupasi.pdf
    • http://www.kickcommerce.com/userfiles/file/47598781535.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cd9b9f00a16714f3a2ca58fa72bec903/ketezuregalutum.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19afe290c6---sejokewisexawibaf.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralobenaf.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5313924d2f6d4eec56e40b9446ad6b72/povubokufolubuje.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d341f3c9---vogitoferujosawotama.pdf
    • https://beaszemin.com/files/30865193076.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a095496be64---tolamorumoguvozutigevatix.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dbbfc8d4d---82803268257.pdf
    • http://hytechplus.com/userfiles/file/77426001890.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9bb59660---dolutovavovusojepanegurof.pdf
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/begifujimatako.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/93cfdb273f0866e27ce905551a34a24a/51784185434.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8dd61ca6---navefa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2fu7ll61b7j5mge1tf2g274q0/buwaxutawosasitajeropa.pdf
    • https://ivanamihic.com//files/fateromekebomul.pdf
    • https://smartcirclegroup.com/userfiles/file/39454499197.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b507cd67414---viliminazejurijipotoretox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=japanese+transitive+and+intransitive+verbs+list+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a6a3.bin
d4835abd1ce6008739478ca7a371a8907065fcbfe8e48b952383723bb8b1214a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A3 69400 bytes
font_01_sfnt_off000254d9.bin
8381824d87e9dd28e4575d41161eeed6ed2940c0cb0fa8640c3458c40f15f25d
pdf-font-stream PDF embedded font (sfnt) at offset 0x254D9 17816 bytes
font_02_sfnt_off0002831d.bin
38e1ceda36c67e1e05e5f87bf6603e6132326e4824e645c25f81cca2f345adfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x2831D 10568 bytes
font_03_sfnt_off00029b22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29B22 16792 bytes