Malicious PDF — malware analysis report

Static analysis result for SHA-256 68160102337a85ce…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 01:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6534d304403a7019c8d1623afa29bebc SHA-1: 013bf1289404147945053f004f472cded53d6c2f SHA-256: 68160102337a85ce3602be3566c52178d84b98d59b978b8ae2ff510402550af9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, likely intended to host or distribute further malicious content. The PDF structure itself appears to be a lure, with the primary malicious activity being the redirection to these external resources.

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 http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608613c34ff61---baxivozuzubakolobozel.pdf In PDF document text
    • http://mobilenmr.com/files/files/86449158114.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9099874e---74757731088.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tumolis.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160783f61e4f0c---libavu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4682d2287b9d63ae9efa95d76271c2d2/27019587275.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2eb56ff86a4287658b473df0950def6c/momani.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2eadab0e---xofuluwex.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1a5f240104484ac886256a19f855092a/13382540352.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/maxijeraravejixepiruzibug.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/navulemalakovixexa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d055a7a2---97456541600.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40a1b802e---mulutikakuxuguli.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zekofasolobekopomubif.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/4828956374.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32bae6ead4---18627076026.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/64420055509.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/betixeketamagodugoti.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/69892ae3c238f271c48bf64e6502a5db/32046817211.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/sigiroperukumorimewamamo.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/91764966800.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c92f22297---juwukonawetonazovewuw.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/besobopumebozirugamer.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/kavijimejuritapabi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ad2a76e61275db419e9022fba386405/gelavoripaxelepowegup.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862962d2f10---71610785953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+nose+piercings+healPDF 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_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16612 bytes
SHA-256: dc066aefdb7f313e86795ce71c65f6be9226e027a042b4d3b83487f8d971c690
font_01_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 10772 bytes
SHA-256: de94950e4154565290938b7e5aabcbcd9c46b31d98685687c611025a1ad84542