Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a8c244566b40da…

MALICIOUS

PDF

196.2 KB Created: 2021-06-26 01:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d849609ea8f58c25cf3dfd66d1522fb SHA-1: 2e299db711d6954d061df5f9f07f5258500c0deb SHA-256: 24a8c244566b40da3ab88855e26dd311f6921660a9aaafd5d01cfd916920e776
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other suspicious domains, suggesting it's designed to redirect users to malicious content. The presence of PDF-specific heuristics related to URI and link farms further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=handbook+for+arabic+language+teaching+professionals+in+the+21st+century
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88464e3773---8585889037.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b0f1382a---17870873463.pdf
    • https://spacio.hk/attachment/file/4603376188.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/60632499555.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbd7cf4e0---6826611314.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609379d01221d---fokadepodiri.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ss21q1pbhgqcu2qi3tv72n6grv/wusotepalaxon.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8990e41a---31828665686.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/365aa36859fc1dfffb39f547aac8f6be/21375057531.pdf
    • http://isgsrl.it/images/file/41637857977.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/rudituzutogubipodisubufud.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bfbd991565b9e986b6da1eb8293e7cca/pigetepabefir.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vdve8t01gmsnf5s4b51u94h2g1/70107259806.pdf
    • http://debeleven.net/UserFiles/File/47971073693.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800cb20839d---ziboterorukiteropepajujut.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/91527145102.pdf
    • https://unosms.us/userfiles/file/zexogorigateborisuji.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084c093de844---86878889174.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8p7o67l73n9v0qglkvvm83sj33/22592456580.pdf
    • http://adveotec.com/img/file/36837910541.pdf
    • http://keramann.ru/uploads/files/nedisulolexonomede.pdf
    • 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
stream_003_off00026e37.bin
89d988d13becd7ce6c56712deaa7ae7781a077282e49b3a24d121b0a874b93ed		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26E37 21948 bytes
font_01_sfnt_off000295aa.bin
cf9768cb232704ac8cc2b62ba5f8d13725d34841417dd2e675d9dd973fc09861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x295AA 23092 bytes
font_02_sfnt_off0002cf2b.bin
60b1ee40bd0a147556795a271ceeb5ee87e008e2f9bbbb79a4a6ea7ec0ffa33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF2B 11508 bytes
font_03_sfnt_off0002ea05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA05 16792 bytes

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