Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03562a3a8368a60…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54afd99233035a6a3834e2afb0040164 SHA-1: 57e3cae6f322831fd22046cd0df67e8de772d6b4 SHA-256: e03562a3a8368a60397e64b82f17c48b5e4dae804bd52114a5eb9212b9928963
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://lamekatus.ee/uploads/ckeditor/files/93722181847.pdf In PDF document text
    • http://imi.vc/upload/files/fezalofatu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/29405392568.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53fe3a580---luranev.pdfIn PDF document text
    • https://dcimx.com/files/modonibitedadexamorar.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fa0ba7ee6926e7410042bae0d8cde9d5/14039033305.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ruaig1jfkiho28p17klte99pk5/zidonov.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/96152496499.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/91io2rk22gj9u5n3e4lr9le4t4/46910775039.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fb797a53---40125846432.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7c10ee331b867c764eafae81d22f2bc0/mulomugipo.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/renaka.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b558b469---lugoxaretotenaromigulefa.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/67630836981.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611267d10ab7c---31334828085.pdfIn PDF document text
    • https://mmszke.hu/files/file/padokedasipe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cc1fa929f14fc728edfe42fd6c60630c/wegilul.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/30644898355.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/37457842212.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bedazedu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/waxitazozefuwabupowasa.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jokifixinepajuroj.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609629541599a---55076484017.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xoretemawufetazoba.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/14899054097.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5ui6tk6r79i5lqet1r9u9kgjsj/43546728102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=simplifying+monomials+worksheet+answer+keyPDF 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 17988 bytes
SHA-256: 6560db4e5f34825787643453e8ce44b3b8cd9f5a60d87e9ec6326cde03330639
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 11172 bytes
SHA-256: 973b2abe7da2f192b6ca65b6e79c70dfe70c1b2aa1171499f90ecd0b5b2f0c00

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