Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadfd8e1888bcad2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 05:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2880e051f4da2f14743cf34a5687473 SHA-1: 888f209d5785b12250d60c5a89ea30d5a11a85ef SHA-256: dadfd8e1888bcad20c395306fe6d75b3de8f4659567ba1505feaf7f1cb205a78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=rice+noodles+cooked+calories
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bfboujjsa3ibhfrb7t2im0ac22ejsdk1/zalik.pdf
    • http://vinmexindia.com/uploads/volixalote.pdf
    • https://gamaconsultores.cl/upload/file/38929207630.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j7sds3kprfh93v9ft43ns7jkn5/27220986913.pdf
    • http://sethhukumchandschool.com/userfiles/file/93206896654.pdf
    • http://dokumsuzgec.com/userfiles/files/dadapoxetojidugomozikav.pdf
    • https://strategieb2b.com/userfiles/file/1985019605.pdf
    • http://swaminarayangm.org/userfiles/file/23303298429.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/48342586253.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b39fb9c223ffcbd5d50dfbd3e777d87f/65073201423.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ju62c5j942ob8nqvbgtbd94pl0/27653957957.pdf
    • https://aduanaldelvalle.com/userfiles/file/50123363356.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/enoplc0kibgjcs4khjnf1i71l2/fisegikevulipateneso.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad0f220cb---vuzekorazutawewoziduvobe.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/73559254019.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/19e9fc30f573ab8f092f7bed04a23b8c/nipabudepusemafe.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866d042f3ab---sepemipes.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/87690068739.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ng0q1v5kdcu0fpnhmpbk6e0i60/59350737551.pdf
    • http://sendedianqi.com/upload_fck/file/2021-8-6/20210806220700994896.pdf
    • http://ruizhishengwu.com/uploadfiles/file/271903327534.pdf
    • http://impex-italia.it/userfiles/files/buvapomerumovapajipax.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ed8a854c---94852738016.pdf
    • http://czyxchem.com/upload/files/18635682728.pdf
    • http://meadescafe.com/userfiles/file/30620427044.pdf
    • https://polandpools.com/contents//files/17762240952.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e693cf26---13547782235.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_off0000ca6f.bin
e68cddc5fe2dfbcc5ae13fbb71c9d2af6106ef519860b8bb5228c2509e615d84
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 16764 bytes
font_01_sfnt_off0000f5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
font_02_sfnt_off00010df2.bin
4452497f23c7801f2af66f58e967c9659a71945cd2c0b7917d1a9ef4ee419c89
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10404 bytes