Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b18d61143fd06cf…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 21:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb6d96c3b7d2d939da4805d2745d53ac SHA-1: 5b1403db081838718082072d9d4ef24f989a0d6b SHA-256: 5b18d61143fd06cfc585370c721a0236f49881e220e2635c007c8d9589c2d1c3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://redac.ch/upload/21352170820.pdf In PDF document text
    • http://tajesink.com/Uploadfiles/files/91580499178.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/26287153732.pdfIn PDF document text
    • http://mamitobe.ru/files/file/30028635236.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904083023440920.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/wimuledoxudedi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/42569601782.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/99987591617.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/kafefomobafiresek.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f11410ebb7b0f597726126f1bd2b09d6/8212087915.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/94145787131.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09e266710---84833808586.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/wixafubipuwu.pdfIn PDF document text
    • http://linza-market.ru/upload/files/55673357751.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nazefe.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/nexumasunitofulutivomu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/rojituxozukorol.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/sotogagonuvosufufovatuxur.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0d0c52de---towajodadonetolir.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/fokekaku.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/davabibaxufozijoluviw.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11d34c795eae7d1c850c7eaaeca84892/84793318495.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/weloweruwijefizuwu.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/26955626418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=national+anthem+india+languagePDF 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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 10504 bytes
SHA-256: e9baa17870d395966d325f0496cf541745fd68099e87d70b10a1363e5ba53d9e
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 15360 bytes
SHA-256: 7ec6d412ee8c2228dd59ec9295dc83f3250a53dea250b18dcb42c037e8837b57

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