Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caa9fe53279a233…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 05:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 034f32ab1797c440a1edb24352e41672 SHA-1: 444a888d03a64a13cb154710009dfc07c2792d5a SHA-256: 3caa9fe53279a233eb5b98f2a5ddc15c5136f94f7db28e4cdb81e4046bc9683f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for JavaScript execution or redirection to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=brusca+y+brusca+invertebrados+pdf PDF link annotation
    • http://dydlhx.com/upfiles/file///giteramukunetibepe.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/31925006308.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138940d46f21---nikofegobiwemugosebob.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/76176563020.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_2E56161C25136190.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/1194754798.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/44037716121.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/35292286192.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46877704643.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vakutimaxotu.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_9A2FF159D9D8A085.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/dovisuguvuvilukaxili.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/48847385249.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/gutawikaxo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1dc2a6b97---pumimur.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161438ec5e5330---zujumujagije.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/17353cfdb82e6493c1b64305e8c98ddc/pofuxagalipukefewixa.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/68189849846.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/16160926213.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/lusimugirap.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/65473716397.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/64779538740.pdfIn PDF document text
    • http://trubaopt.ru/content/file/mijobatixizevikiwika.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/12403225647.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_off0000b903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 18240 bytes
SHA-256: 2c2ac85e26dc6872db95b1302552ca80542b9ada1288c8ce59e73323671b7173
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 11040 bytes
SHA-256: 7d5ea026ebd4bf045dae91e40e0b3a41b178e13e870810e310cd28d1f029f48c

Open this report in the interactive analyzer, or submit your own file for analysis.