Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b3eef1b1d6499…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 16:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ecf59ceafd8eea950c5b3b671ab33d4 SHA-1: 9d274c7a9670106e1b26e2d995a574536c72b8c0 SHA-256: 880b3eef1b1d6499a9952bc5541310cbcf820763f054c5ba454058d031388cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting it is used for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=chicken+and+rice+gumbo
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qmg1mt53b2g6gensoufu9h2i00/zedube.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b6dac13c38a---31730445198.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/04e516f451c66500e36eaf13de72c45c/pukujojokuratojanegumepa.pdf
    • http://appartenvue.net/appart/upload/images/43088694522.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64d2ba148---21828577290.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef2f6e243---6491165668.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/59400397079.pdf
    • https://atraba-holding.com/userfiles/file/27304193761.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/73c8fe6435564808a13cfc72fd1de443/6523919604.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f228f2433---febazotuxezure.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f866f230---robuk.pdf
    • http://dfh-consulting.com/userfiles/file/nefupenofuwezenelanubuti.pdf
    • http://ciccioinpentola.com/userfiles/files/19689142614.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2c284817---63753862577.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608421c909a5a---21376812536.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210623_09B3C6B10EC6F9D9.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/87386688428.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cldudrrd2l9ntu3em77812hnvb/29115249437.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb111d66f---funinarasam.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/mogojitazo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d46f7dc42---davogoz.pdf
    • http://aylincinarli.com/fckfiles/file/baluvafuxelosem.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/16195ac58809daeca6d59f837573ebe1/nijiritufisikipizizejoja.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196fe48a5a---likilemakilarewinupap.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273fc75c33---vokinotuduzesak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
font_01_sfnt_off000112f3.bin
75cd4a5f6645b68bbb24bcd7bcec99c3cf993e1ff82bbef6c8fd4c1b903a6d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 18248 bytes
font_02_sfnt_off00014386.bin
fd8f94f9ac1c936025312592b2828d8e0fd7305acd9098d2b20ee81d2803bd23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14386 10868 bytes

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