Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d0c62b45a7352b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 17:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a7409917af751bd3f07ed09cfd3c706 SHA-1: c20a4bbce571e19ff493a75669f020eaf0250f18 SHA-256: 93d0c62b45a7352b72c2ef1422ff7717bd0d09899517bb6f8b393859049e94fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous links to external websites, some of which are hosted on compromised CMS uploads. The primary goal appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://mrs-edu.com/sribati/editor/uploadfiles/23432758168.pdf In PDF document text
    • http://japhina.com/upload/file/zesopa.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/53107500721.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/59323853132.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/20366014960.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf4cec665---kilogutanoburisopodik.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • https://nls.vn/upload/files/virejuripokesegiw.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/kademanogax.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sefuwaxogoxedefobu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1a2d575b0b6b54e4ef80498a61cbe1cf/gagesoge.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/32771334442.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fesefugukoveze.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mazefowas.pdfIn PDF document text
    • https://htchninc.com/d/files/55828000835.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/93538762778.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lifolixopatidixunepawim.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/zebepa.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109131859506902.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e43af53b---melisavomibitoxajapodewi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef6f44fa57826e6cd6116143c40969e1/29911898935.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pitumewadapi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/095e81240c721776331c5f69def0cfc7/13547954155.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8176df78---83373705511.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/nefokerovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=popcorn+time+lite+apkPDF 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_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 10460 bytes
SHA-256: 611531f951db19fb43911a8964f5c8df57bbf95662fc836353eb1db7a16ef6d4
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16860 bytes
SHA-256: 5b11f2480278d4487d15b0496c8624be8c5448285863a7103a31180d677552b2
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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