Malicious PDF — malware analysis report

Static analysis result for SHA-256 3083ad4036366889…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 04:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06ae38591f9d4593c82396e14e088bf1 SHA-1: ac36452ec997a4f23584c58a93587af921c2ff26 SHA-256: 3083ad40363668894ad7423fe5ba4e971e194b060cfff532b5e8a75747b7e2a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on WordPress upload storage. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://crysiq.ru/uplcv?utm_term=screen+recorder+for+pc+hd
    • http://www.herbertvanderbrugghen.nl/draft/jadivowaze.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2abqvc5m1iqc3pone8niu6ud6f/musisarejakikibimelupis.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80f3060a5.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad204b5c2---zaxezavikopoj.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/rodikilaxuloputoxomav.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/jaguxisa.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608714009d45f---27978913839.pdf
    • https://bandai-k.com/userfiles/file/pubavuribixopagopufuveni.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7c0a25742e353c71cc40d7b165ea47a1/59640699360.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/benoxepesigezonogupet.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n949iep2p720ibt1d682p98iud/sefuvowakomibekipi.pdf
    • http://poslovniimenik.net/firme_data/files/36114374832.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b80822ebd7a9d190b0de90e159f801b2/11975672088.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2385713e4---rowitovuzafigefapa.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dq6c9k6eium0gksvj6jidfkvb0/jolesebiwop.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/950f8270341bf239b4cae4d4fcdc254a/42767437447.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/33428223237.pdf
    • http://vyrukrc.lt/userfiles/file/rosulufogegemiru.pdf
    • http://smcertificationservices.com/userfiles/files/namer.pdf
    • http://akwarella.pl/user_uploads/file/kedog.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf852292fa6---65799916557.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5768aab7---lulikofezuwamalonof.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1319ee0836e26d492619f338e54778b7/bovagisowarebonumeb.pdf
    • https://oklogistic.lv/upload/file/16515220521.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb44d234a---reduleviganedipupudedor.pdf
    • http://www.aportecnica.com/imagenes/editor/file/3561135437.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7939acd42---tipudusotalubi.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_off0000f1ed.bin
1d58cd704cf3a499ae969c267a07daaa2f8310dc67f41d75373605437ba6774b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10228 bytes
font_01_sfnt_off000108c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
font_02_sfnt_off000120d4.bin
1ce505e762ead96298c94e53b2dc83f70c4e02cb71aa5c6ef1d97a83aba36127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 17108 bytes

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