Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dc53ecac196466…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 17:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 734cf37520abf06d53e3ba65fb001a43 SHA-1: 605abd8d7b4b1007be35fdf19b4e99d9de54b3c5 SHA-256: 11dc53ecac19646647215b7fc8225a622521ab63b47e79f768ace20fd0dc2a60
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous distinct hosts, several of which appear to be compromised WordPress sites or disposable hosting. The primary malicious URL identified is http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d8faf898933---26871560869.pdf, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.logistiekverbeteren.nl/ckfinder/userfiles/files/39637442815.pdf In PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f2593f41b954204267e01882fc6687db/rorimated.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d7c7dc0fcc0e5484e83b7b5e6d2a315/xizevubapubovenewip.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/73122694804.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/borasufabepetiteligi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dd29011abf5baa2aec350753b797b508/duvetatajupozivulegizokam.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210731004417.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/denezaw.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/ribojanud.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/pexem.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l0sjgeugb0kivg8rt31i3es9nt/farigufevubagesenofan.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jujugopukinovapagun.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ae6da1b1b7fe4a5b8b982aa37486c4bd/wikufogasuxe.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3vrcm5bbt51vim76mnag6rmtsf/lafofusefaxewojapufexisab.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070026778593---rofixanat.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9201a1c2---tivizizemejumadolez.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zudosazumotulosijap.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pekukizuforerosaredi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d8faf898933---26871560869.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ad22f851---43434349234.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6b3c6ab5c7a5a061eff04144b8728c68/tajekame.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/nifoluvotozelaxilimamero.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/5fcddd7999fcdb57a838dc4655cf6c9b/51048428810.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/27084580772.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160767756d29e6---24742232941.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/97337190471.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/341606c6308fd31d18876c4beac87ad0/letodipoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=84+charing+cross+road+libro+pdf+gratisPDF 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_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 18264 bytes
SHA-256: bb10222f1db01315cf90bbfd470a539495d5bc2fedf42c70316737b749cde547
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 11096 bytes
SHA-256: 58334961f102aff047bd84d19a4a0291befc53bf6de75e159bdf0443ef29efa0