Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d86ab32dbc52c20…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 09:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 793b71b52a1b19cdd2b88018ffc7c91b SHA-1: 2cf428b9a784903dc1c315cb0ce1cbd1d89215b0 SHA-256: 0d86ab32dbc52c204c0d06e2c573880db818556dcc97483c7e70e0df2f686085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a focus on SEO manipulation for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crysiq.ru/uplcv?utm_term=office+professional+plus+2019+product+key+free PDF link annotation
    • http://unseretochter.com/images/file/mupuxuxogezofu.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/10872825291.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/61719017953.pdfIn PDF document text
    • https://fultoys.com/userfiles/66117571088.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/1608018803.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/bomasux.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/48929475ae0a7c78d3d4b85c5d52c3f4/zanuvifepibugabomape.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/99846606092.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/fulidova.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/647417cc4b9b2049372117cfe5a8f34a/96377339691.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/35091899508.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/lajan.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec94152794---narisumorunew.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l3mkfgonq17fpsukrlnpnkfbpd/85256644688.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xoririnexirewafovele.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/semonodedazikul.pdfIn PDF document text
    • http://chamdure.com/DATA/files/mowigasetevi.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/72624741869.pdfIn PDF document text
    • http://balone.net/_upload/file///35643085524.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5uvbdelnbjq1iinnh572i86g9p/xofufanevabufap.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/69135006647.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/92837541290.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/22987996264.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/puxenitinuvawaraxutusat.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/31883220213.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/83439673147.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 11404 bytes
SHA-256: 61896cc233637240be4828a063c622a5dc51d64ff26648eb182c0c123fe83491
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 17480 bytes
SHA-256: e0382fc2128fb7ade5f32a32342eb8196c8b59c8e5d8fd4804e0a7c3b642d221

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