Malicious PDF — malware analysis report

Static analysis result for SHA-256 932b1cd6f70b3713…

MALICIOUS

PDF

106.0 KB Created: 2021-06-29 12:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d2c6e74fb66681e9e29ce064b26ad6 SHA-1: fb847b1d72d9fd197799f7402cf0eb5a5a2a72f3 SHA-256: 932b1cd6f70b37131205e5c265c594d6c151790110c65b4f48b96d03971d4136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

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://okmarin.ru/userfiles/file/berodot.pdf
    • http://studiofapas.it/userfiles/files/97328901446.pdf
    • https://chris-arnold.com/userfiles/file/32437168951.pdf
    • http://drironcat.com/images/file/sanipaxo.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68ada7a634---jogimuvevagoxogikubeme.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/woxulibud.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160718df24091a---514784717.pdf
    • http://cnpair.com/userfiles/file/71940137626.pdf
    • https://sonarmusic.hu/up_image/file/12416763214.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/16ab1e6a7c613d7b41c0798e3c683b43/sorewenewovejesezimagufu.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094761894b08---jasatazokaromezuzi.pdf
    • http://birnagarcollege.in/userfiles/file/wufezolonifogalif.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e3dbedf5---82754870733.pdf
    • https://sayurhijau.com/contents//files/60401600915.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbb10ed73---21013767568.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16093c883d2409---pumijuforafatepenus.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/57b1a0d10660afece36666c13883c37a/21469893328.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09303b9d0---16708305191.pdf
    • http://ahkjt.com/upfile/file/27854016932.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c224c20b55a---33505364431.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4f3ef2ad94de14c955c77b99a9d15b26/denifozusatamuxarikeju.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcff3287d---bovuxevovememe.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/xaneferuzuso.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/2jkqr7hva60ep3btui2g647use/74436297421.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f27a65ffc04f0c263706a077465db67f/venufowemapinuginot.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0482502006---82205229700.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbb84bb95---40350652549.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=field+party+series+book+5
    • 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_off0001285f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16792 bytes
font_01_sfnt_off00014076.bin
51e0899d0c25d1dc358726962432df7ccbdf333b951a922ac668e3e8b3a083b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 10736 bytes
font_02_sfnt_off0001590d.bin
6a1218bc9ad23fac4a908bb7f30b8aca25c2f8f201e02b2e812719be63ac347b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1590D 5324 bytes
font_03_sfnt_off00016cf8.bin
f3671ddadff58904addda1e04637702fc5f1fd02173b7925be8ad57c1c75012a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF8 17380 bytes

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