Malicious PDF — malware analysis report

Static analysis result for SHA-256 41081174c8f8ad05…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 05:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c73129fb5836d63cd52960758deb785 SHA-1: 710952b1888096fb08f97f168194d44b54df232b SHA-256: 41081174c8f8ad05e55b2a5c7b494ba87f3c72be20e20483fc6b9a95f1edba23
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=captains+cove+homes+for+sale PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/buwijozufanazanidaxobawi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nesb0vngo00jbggvcprt2c8nc0/72662022951.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tekovekadagupuvuwodowimef.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/44726548365.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jarukudulelidin.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608474efe8a0f---togigixokutoluvasagixuke.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/272231383417.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608214200df2c---95468320804.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d1374d2a---76051880518.pdfIn PDF document text
    • https://scalper.ir/data/files/file/26435680407.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/kokisuzuvomuzepebop.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/54580250361.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sizesinizupar.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/larixetasebegopukitob.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/pizozo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/12126883518.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d433fd6810---20552868171.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gagor.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c570b69ee37---kiwivewanaxapajuwom.pdfIn PDF document text
    • https://norservis.com/files/files/velid.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/vumududitizozi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sunesemufokabekipu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/4339366433.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070310be395d---88351079557.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8047d3996---52134306139.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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10844 bytes
SHA-256: de0024b45ede0b4a4f1a1f9173932662b521ee9279706318db5ae0c9a79e4cbc
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 17652 bytes
SHA-256: 061cfe6e7874f39a782ebe0c9509a050067c27c1e7099213785e7af2f5adeb71

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