Malicious PDF — malware analysis report

Static analysis result for SHA-256 e778f2ddd1a867e6…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 14:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52d004bc1c16246833646e792f6eccce SHA-1: e35d10ca068e9468eda3d37d5ae158b1634c8948 SHA-256: e778f2ddd1a867e60dfa55d30aacb4797f63ea52d7ed9e86283c6f45dc899173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple disposable domains, designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mgocsm.in/userfiles/file/23049572760.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/83860149439.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c619c6f368a05b703fa09c312e75aa3/55738419689.pdf
    • http://classicalgardenornaments.com/uplds/file/gulimuxalen.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23aab0822---94623361164.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/vibozutonekidexoxuwotowi.pdf
    • https://aedwea.com/upload/foto/vagekegemu.pdf
    • http://j-club.eu/userfiles/file/xesalavirido.pdf
    • http://www.findvoters.com/userfiles/file/suginifalixirugakidenozo.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f1gl3hj26r0olfmcn0dn46lq07/modupudazime.pdf
    • http://amadpich.com/userfiles/file/guvaw.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/bagejebonijuxonadedogi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/760728d926743092b497c03dd112e698/kevunonowiniketidatipiji.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee91ef267f5---nejegowikape.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f38788ed---99837367604.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nt5rn8qj535emojslv3i051m2g/95215829787.pdf
    • https://twinslock.com/ckfinder/userfiles/files/70809853756.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b536e665---wamagefazukagekiza.pdf
    • http://gomientrung.vn/uploads/image/files/sesinadawenozulezataran.pdf
    • http://rwdwebwebdesign.com/img-aim/files/27537681408.pdf
    • http://abwingstop.com/uploads/files/96691404469.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d29888e7361d95ae22fc40ee556da9a2/24309563389.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/85ff5b0867989ba59f194e58a5c04e1b/29255041604.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbfaac14hj3crbsjadpbdtsddf/79479624150.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+summertime+saga+mod+apk+unlock+all+android
    • 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_off0000f434.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 16792 bytes
font_01_sfnt_off00010c4b.bin
33d5ec210eea7ded00a7f64fdb02750d4bf7cd158640014dc2fd84b90f927fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 11136 bytes
font_02_sfnt_off00012626.bin
43194313aab2c7648235fd00022e1f4d0153587cc03bd2602762b2366c6aebf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16872 bytes