Malicious PDF — malware analysis report

Static analysis result for SHA-256 273be8c2a4492bd0…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 72c02c707206e3a55e6b26516ab7b31e SHA-1: b975dfab96e188bf203f4a5902f571d509e92271 SHA-256: 273be8c2a4492bd0b4fb8d8b81011382f7a21e73ebd9dce86266b70ddf5cde84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting it's part of a link farm or phishing campaign. The presence of these links indicates an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c738a04bb---53371457815.pdf In PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fkhsai2f9eh7sj27f16cn26me6/18643540864.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0922cff19b9c8da8a1b4d1a86f93b8c8/jalumuzilawumoparog.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/79508561748.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a683b8130c4---42857200098.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780ed15df3b---21460193873.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160919b1f0d1c3---mufuditud.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6928c7af6f671eea684b0c489d1103eb/80949971272.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/56146640212.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/88887142152.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/04173cf8f8d8950745a9ddcb5d5a926a/kumadafeguma.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/83629037504.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607623244ca80---kugirajizipigekilefa.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/58903324099.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89afe8bb8a---88057146492.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15721388591.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083905edb965---tigolifikanomolik.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fa09623230456a604a3f7a7268bfa4cf/vimigifokuvedalimibi.pdfIn PDF document text
    • http://akssert.com/userfiles/files/pamusizezikosubekevimofa.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/56393448702.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/406mea9c1r7egv2phv8lcv8e25/34080635254.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b1ucsed93r1s9oqcvv8uqprm3a/75988338580.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fuxumujomi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/11920397024.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03ec50e83445dd10250c58d044940e05/dofanejenanegujunekedojub.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c91ebf28cf624864ff1bd6e4989af73/3787385325.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160910146eaccb---kuraxavidelufamanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dried+kiwi+fruit+caloriesPDF 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_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 10644 bytes
SHA-256: 241a957fa0adcf599a110667bae1bfdd6be53f8191c9f04f0b890588251d28b0
font_02_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 18048 bytes
SHA-256: 951183725fe5975c477f983b66540546973b1f6d7e7807db0d09a25651e4f668

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