Malicious PDF — malware analysis report

Static analysis result for SHA-256 644bbc339244fcf0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 20:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40167ffb4ed391ff2bcb81a6b5e54de9 SHA-1: c457dda4887965ab1103e0f1fe1e62a44324fadc SHA-256: 644bbc339244fcf0bbb64b0df108499a340bdf45eec965d7d337114f1d811e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://erainbowrealty.com/userfiles/file/35159124757.pdf In PDF document text
    • http://leguido.net/files/paxowina.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xojerekilujul.pdfIn PDF document text
    • http://aven.su/userfiles/file/palukusabuvapetegerisilik.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a9df1bd6db7c670624bc22ff81771db8/mabuwesaxolanoxu.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/nutasiliwuriwuvosibiwep.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/73287599959.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e702723095---pufavejivogabegugugopox.pdfIn PDF document text
    • http://productosole.com/wp-content/plugins/super-forms/uploads/php/files/n3fknbd4n5pehkuh650nfmg2lu/3630592823.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/duvuduvejav.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/vevupofaluk.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/7482983630.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e0281f5782ca6ddd8ba8a72c0e0ff34/1113754443.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tisuxaferil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g240bhs4vorvp5f0ig9rdfm334/wopibofizopenemamarufam.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242418f0e---60644702483.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/60306587186.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nazizadoberotozovaxaf.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52601858485.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5b5u98nv7j9kjarnc1i2592pv1/lodalegoto.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/62330786409.pdfIn PDF document text
    • http://bakoca.hu/files/file/silumumetewutapuduzelis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mnemotecnia+pdf+gratisPDF 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_off0000bbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBA 17776 bytes
SHA-256: c5eccd2c512a9fd0d2b4a986bafdea294db05e8b452cc660e3d82d29391ed30b
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10908 bytes
SHA-256: e261d768742ff2cd08bfdc1cc0304fe8fa7222cf4b6f8ea8ec4280beac7b3a62
font_02_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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