Malicious PDF — malware analysis report

Static analysis result for SHA-256 547f0a40cd751e67…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 20:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e34ed5498eb6a50801cf0164906403f SHA-1: 6d7745c6546aff4b586d7e25e45a16a2501206f2 SHA-256: 547f0a40cd751e67d0cf37b83b86a1b215249d98cbafa98a9c18bf5e51866873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=citroen+c4+picasso+2016+manual PDF link annotation
    • https://total-sport.pl/img/upload/files/16730986166.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/18505148197.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/58747694884.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/19b2b0633e18ed6ad76912432959aae5/ropefexodebobumobikad.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/luwazazebanakeniteruvit.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/51872759987.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd98a96684bcf6b651bf8317c86a1431/57553845264.pdfIn PDF document text
    • https://rajakedua.com/contents//files/65953125196.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4549dd7f6a3ed57b19f4da8e9bd40c03/radixoruzu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/60941d0rs401guflrp43de328i/lomawomozerazifupiv.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/sokidogudazaribamopufor.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/sipibodakalijadosojukoxa.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/99572813419.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61d6dfc31---21730495138.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160919b1ec9c35---61222184243.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/33988038014.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zufumemunakig.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072a66de020c---106722818.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082cab393ef5---98688458394.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/suxazosobulewimuzereso.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/vogajejibabe.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/dejemedodejukuruw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e154ab31---46165741638.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/6394860672.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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 11204 bytes
SHA-256: a29fac5e32d67a02d201b7a2fd82c850c5d3a138c931647a69f5532f20e094ee
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 18028 bytes
SHA-256: b92c6027d48e28d2738162a93495c7da9f458fb0a28962c9c2d66c8dd443450e

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