Malicious PDF — malware analysis report

Static analysis result for SHA-256 a966445b2011dc7c…

MALICIOUS

PDF

89.0 KB Created: 2021-08-03 07:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5a649d10918e89bbad56be06d8a18712 SHA-1: 62879d108329b3c995dde62e588b911129161373 SHA-256: a966445b2011dc7cbef621d241fc6309728ba9e9a9f8f145f071e2f7e8c2a74b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a link farm and attempts to lure the user into executing commands via the clipboard. While no scripts were extracted, the presence of multiple external URLs and the 'Clipboard command execution lure' heuristic strongly suggest the document is designed to trick the user into downloading and executing a secondary payload. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sjar-tech.com/uploadfile/file///2021062709442060.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/45976774662.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/58883b6c20893041e84fffdeb66a403c/keledasigipurukowibaduzet.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079acbd60a5e---wufutesumokebikigeva.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608261120fe7b---23199370924.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097120b8383a---89797448429.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/noganapafakupovamu.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c389b430c---kixopabozobonewuwebi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748756558b---5050921868.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/56301015063.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vakivevi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1164b1665e2f51e6a969deb5be8a1067/58027934047.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/kuzelesekunaxupufekeda.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8d05f457---89348093773.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/34169372906.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607643222f0aa---26855204676.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/fikadilop.pdfIn PDF document text
    • https://samowar.me/upload/file/84926501380.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/nonomamaje.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/82274669627.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/53efdf8f4a7ff08a41dae1f5a00e55af/vuxomiw.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/fuxuxulujof.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97855058607.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a951fb1a0eec6dd08cc173eba138f310/tuvidepabevibavodel.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/521e50418ad418bf79027e4142c34347/pujuvineridevefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vst+plugin+waveshell-vst3+9.2+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 18324 bytes
SHA-256: ede1a4919136c58655fcaec953d672895e7e641e515657e79f3d0f865288cd70
font_01_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 11352 bytes
SHA-256: d145022c4008273b5895d4f54ef0c42d7a8ec3a9a4afa712ea1d74e26e62fad7
font_02_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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