Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4feb9b416bf5904…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 23:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 454cc5b8593b0f4c09b6c877f37c8f42 SHA-1: 8915d5cf77da405c910863a8e13e29b931ce558a SHA-256: f4feb9b416bf590404c1fe7475af5c8d8271667bf6e0734b92dc16ea7f9f4b69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or a distribution point for further malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rallyteamwalraven.nl/file/32516438973.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fe9c9528---kogoviperiralufezote.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609efaf963910---kojuvokulotovudos.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d95aa096a---8417033491.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/846576a3d96dc6bedaa1ec6da7b402f1/sikiniz.pdf
    • http://hitecds.com/userfiles/file/fibiruguwokad.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f17b0ddae93c867f1a0c54beb1d851a8/65419811326.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16089f51cbf58f---77581627835.pdf
    • http://cheapmarkt.com/userfiles/file/jereberikanibapim.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087c35f08a04---17458004741.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8qkv5jd4i1tvf3th081e6lhf8o/50780860752.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2254525---jovasutinuxibobojetaxuv.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c85834893eb---fobagosugin.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2314018f33---87027134224.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080a55f0aae7---21926794318.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9de81e62cb3461f97c302e740d3bbeb8/mepupokoxamujujamemoguri.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eba825b29---fawugul.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/6463184089.pdf
    • http://brandnewgoods.net/userfiles/file/54105840735.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899d4f28e8---vepoguvimegife.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecbdac153848739428a7f1ca0285bdc4/18380975936.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/tawokolojoniza.pdf
    • http://animationcoach.com/userfiles/file/tulareletosarogogas.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607513262a0e9---47275378691.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/0b4fbb384813d097f3671a1f722fdd90/jitikalalimededokuwo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+find+the+altitude+of+a+right+triangle
    • 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_off0000ecde.bin
db24aa3bd9a14c38de02990e6aa4cdf2db3c777cb96e117d3fee37cf7822d025
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 18224 bytes
font_01_sfnt_off00011ceb.bin
8bfca702513149e3a6d7072ba72d46890e224506417cad88fbf026000b59d2af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10756 bytes
font_02_sfnt_off00013565.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 16792 bytes