Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1f0a2039b18ad1…

MALICIOUS

PDF

77.1 KB Created: 2021-06-29 11:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42fcd61b90a039333d4561924d863d11 SHA-1: 4512d965458d4212e253fc285cd50cf6d80539c8 SHA-256: 1b1f0a2039b18ad15c4c82a81e6a8757d94a544720c1d1b1de4e2a5c0f8f2967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c3e68830---xonugelomamaguvekapin.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a937e5e9522---momamabedigo.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684153e12d---wugerovugudadowitaxex.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/fibewaxoguzosit.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d33fa258632---xezikasanogerikejitizibis.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2422a657---nazujewomaragobisosareg.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c03732ff---gijipezud.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070c95116692---kevabiravam.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e32f1c5---15211379380.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/dpg0cr4b0p0u2sjh7jb5atud93/ligowarifajewutonikewuzij.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b15e2dd71c2133afc522a1fbe6b0ec41/zotijabedapu.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5b4cac24---92547399880.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b6a0b28d935a8052049980de2b76dfb0/silumubeditujog.pdf
    • http://hodinovysoused.cz/upload/file/nekateg.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c235eb6f69---34107596505.pdf
    • http://www.hydro-tg.pro/upload/file/76139417343.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c038df3cf32---malufo.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8452f901---pokevadenaje.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fbef4d9a75977bcf4187ee176689ed9a/21273117847.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160847c01ee900---42169934536.pdf
    • https://careersourceokaloosawalton.com/files/public/50349048781.pdf
    • https://auto-rujo.com/images-editor/file/14215879977.pdf
    • https://stillwaiting.org/userfiles/file/65496361355.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sorting+nouns+verbs+and+adjectives
    • 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_off0000c91b.bin
aba897221e1b666e1b0523107c786ce6a071f7a7afcd4c38cafb05623b884e42
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 11012 bytes
font_01_sfnt_off0000e29f.bin
ae73046dd1cd49d5dd5025dd78388d7c20936704d4e3a8cd47185c5c426c0539
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 17072 bytes
font_02_sfnt_off00010f59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes