Malicious PDF — malware analysis report

Static analysis result for SHA-256 890d473e2014e18c…

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 08:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e8e01a1fcd3284bec3d817e70e03eb SHA-1: cf3f2de104767ecbef80c24fa872c2a5e8c86bf2 SHA-256: 890d473e2014e18cecaa336b61a62dc9a839f8071c62eb73e78b77d02dbdb20a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves directing users to external, potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078950ca43c4---jopevurakani.pdf
    • https://kermiradiatoriai.lt/images/files/goganarafire.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8d126df8---13163999857.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd2f8ab35---86818250145.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a91eea61---24131131793.pdf
    • http://rheinmotel.com/userfiles/file/64064251218.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b7e2e18f---kapotosenarulawini.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/18h5aioo2dtbbrr9hcgifdahpl/tavitamokewirugakupalani.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ad193bdf7f05c7070a52dbbc72629c66/rewogeti.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/89e2b5dab0117f22e130ae15ceaa18c0/saguji.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088e2f3badf2---662079639.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/edbdc8c88eac1741c36ba02a84a85583/23934950633.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160888c028b3b7---xijazavopizavenurubobanu.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/60aec2d605c9a01cd8b478d76a7eb7a0/65189561374.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1597fa1173127de7bf4a3a4cc013a9d4/weladoposilijekalixefo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7b9984d38e6fdc2ab6a606d41d0fe858/76949080264.pdf
    • http://jshtextile.com/UserFiles/file///jiwuxagobojodesinodevak.pdf
    • http://bigsvatcharasith.com/userfiles/file/7245723703.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c179a2e2f---37372340862.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944da77aaff---takidavivuv.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaddf19852---48660767865.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/7jdm208shvhihv60i0grgq5vm0/10368723963.pdf
    • http://lab4050.com/upload/editor/file/wamalonojif.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/63884992691.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/xotifugapevopuwu.pdf
    • http://jatyn.cn/upfiles/202106/file/1622632288.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lumber+tycoon+2+dupe
    • 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_off0000c823.bin
3dc0360c85cc1a470555a096c2a17dd4a97d383cfcdf74cd5590717b67ee733c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 10640 bytes
font_01_sfnt_off0000e052.bin
885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 17112 bytes
font_02_sfnt_off0000f934.bin
a74363bff24ab07bfa755f3e6940bd1bbe92d541b40daa80c1226e989a4e500a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 15948 bytes
font_03_sfnt_off000121fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes

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