Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f096c14de3ff50…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 02:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 479b87159f624d01c4888d392d0c3f8d SHA-1: 07c8fdb9e0eb0923fd7f06e6d786a4e087e3477a SHA-256: a6f096c14de3ff50b269a9c553b3e23c3852d6a2eb45489ea9b584e56b25c74d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ketchas.ru/uplcv?utm_term=at+last+a+life+paul+david+pdf PDF link annotation
    • http://autoneza.cz/UserFiles/File/xepemafusegazofiwomedu.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210904055424.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/zonebaxipavukewuzuteru.pdfIn PDF document text
    • https://pellevah.com/upload/files/6085850143.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kosinelivevesotape.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/48838208325.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/30974466805.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/31821638962.pdfIn PDF document text
    • http://www.heksan.com.pl/file/80791824815.pdfIn PDF document text
    • http://a899.net/userfiles/file/wegedurukibitije.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/sabepokovagosanazoxam.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210913090302.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1fdalb3qvoopasa9vab0t788ek/22577132925.pdfIn PDF document text
    • http://laserinnsbruck.com/static/zedoxepidiwilixapafex.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sunakafe.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/liwivumigiduwuvesukat.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/83856848289.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/45528397169.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/lesezuwof.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ce2855e90d9767db8054c4c2b9ca1c30/fikovexanuzezisunuwawon.pdfIn PDF document text
    • http://exosushi.com/uploads/files/pikavu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3034df9c47d21992c87058789952735d/wenefuvu.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nogaxerenigupibi.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/laxivituzoxuxotivexusuko.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411d42e1eb7---7252770097.pdfIn PDF document text
    • 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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 19020 bytes
SHA-256: 9cf8e358e2375421ff465cfb0699e1d948ac49a2c2180fef0da681c60d6e8a9c
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10316 bytes
SHA-256: 5cf12a65f6f93592a8fa98d0b8ea292a49c92257fb4001f0c58325a1170e4f63
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1