Malicious PDF — malware analysis report

Static analysis result for SHA-256 492df6679f4034cb…

MALICIOUS

PDF

101.3 KB Created: 2021-06-30 08:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeabb1448f1daec0f0eb420e18bb7a9d SHA-1: 12b905dbbadc5831599ad5be2f77180fea32c5a4 SHA-256: 492df6679f4034cb1191964ee231b6e436388c1e7f5d380ce0578fe6e8e31989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest a tactic to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/25655c59df38a6065c4d252fbd0e25a6/28253528249.pdf
    • http://thrifty-uy.com/files/others/9385902575.pdf
    • https://aedwea.com/upload/foto/40642612011.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/19154505190.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4kkk29enojrtup2fo53o3o3u0/75424859631.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3p9jlgq8pb08jp8011q0vh7ri6/lomojunukila.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ee8dd1428a2381699439ae3855ae4ec2/jazukokurufujiwoxod.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e16a31b67ee9c5c4a0fff230eef481f4/67436156578.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ehif4888f3bdq30df9334iin8b/nivapivuf.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075783b6685c---worepegazatewuliluvazixa.pdf
    • http://skyfestival.kr/ckfinder/userfiles/files/kekexenebijibovetipimik.pdf
    • http://uniquecharacters.com/upload/files/mobozasobaluwodepiniw.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6fc6c2c209011330442845637ded39f6/95841532306.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/36c4e1d940a2e3214e11854e7e4bed1a/dugixujanomawis.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba466c27c6---rukakifemuf.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46c655089---bumasagutiton.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098fbc141443---danulibuxuriwisix.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e3764f6e---zelaw.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/77470366146.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4fc47ad6---42882844625.pdf
    • http://446888.top/userfiles/file/54581079543.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/98854147919.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33efeb31c---fidowexaluvowo.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c2c8af426a4e450de51782c8e3f2c487/90891000207.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/896nmb89iaaol143sjiiog5711/dejunuvidugexitedire.pdf
    • http://altaprecision.com/userfiles/file/vetir.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6ee52bc024d359e2a5f193fd9b9b3b72/nurula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+baby+led+weaning+app
    • 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_off00012af6.bin
4752941b2730277b132f13aa2f542bfcd01a5cd108031d9bf15f1df57019d2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16976 bytes
font_01_sfnt_off00015725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15725 16792 bytes
font_02_sfnt_off00016f3c.bin
70fc277e791c23da7e50a64b2b5bb99f1c3eff2d88979df0c25e5d07861ee12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3C 10740 bytes

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