Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91083c2311cf107…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 00:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 058ed161099d6327cf2bf118f43078df SHA-1: 00a5e5d8c89bc8537c26a116372fc3af8760d81b SHA-256: a91083c2311cf107d2c4b2dd6b5e1db852a0fbbbf9e2a50606fe911eb55b3bdb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. It contains numerous links to potentially compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier also flagged this PDF with high confidence, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://oniceh.ru/uplcv?utm_term=switch+hack+guide
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sbsvrle9g66b2mtdjuu7r333p7/43357209286.pdf
    • http://ubest.ru/images/file/58703969793.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8dd61ca6---navefa.pdf
    • http://boeschfamilytravels.com/clients/43210/File/zerizokumazomilalojili.pdf
    • http://vickerycarpet.com/uploads/images//files/84136442127.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8e04b320---nijikaragomak.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080036776c00---19514247380.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4horbcd3fbj95ar90cdodd7q33/76895450110.pdf
    • https://hazeloyun.com/calisma2/files/uploads/rokilejixe.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa4828986---vitaxelogiromulo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/24e2bde49d4a9e26e9600b421a97f109/44152010753.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79321f375---kefotakejuzimamuzuxen.pdf
    • http://www.ez4parcel.net/upfile/files/2021/06/26/71657547451.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cc4a8a61157d80e16a053dac989c72e8/86107148133.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b277b2ccd---21556794110.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benataledutemividux.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bbcaf014---76756725630.pdf
    • http://123podkrovie.sk/editor_uploads/files/xegixosaxiwakelenugisa.pdf
    • https://wineart.online/userfiles/file/64392694199.pdf
    • https://brod-plovdiv.com/images/talupudemixenifazi.pdf
    • http://chiaranannini.com/userfiles/files/51327539034.pdf
    • https://creativitagh.com/pevron/www/img/file/bedavavilulobazawug.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a0592bc29d8---43910809196.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975c9885685---5728595050.pdf
    • https://atamergranit.com/userfiles/file/gopuvawuzatejokot.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_off0000f451.bin
e079b73e10bbffcbff0ac8f121414b929b169cc01a2210b1d2c076d96083f923
pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10464 bytes
font_01_sfnt_off00010c1a.bin
b39f8d72b531f7ad74dee91a2babe3ddf93e87c9216da4d6ae80ab02b9f8c61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 17940 bytes
font_02_sfnt_off00013a97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A97 16792 bytes