Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe809b0d4813224…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 435a36295001d19fd913e2b148ed1bfd SHA-1: 98213661d71c352ba22adc6d4689fbad1d02a5f6 SHA-256: 8fe809b0d481322479271066b00b87c8a64574f5b52e3557614ed9756a0ea0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=not+receiving+sms+on+ipad PDF link annotation
    • http://elitvorota.ru/f/file/sukapebafojaleba.pdfIn PDF document text
    • http://meditopthailand.com/file/pivoxiratugedukepid.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f420a3e2---vifilewenunugiwonasegi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/da4f318d24393771b0d6bc6f1b9ec112/kojibevulidar.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/31984851760.pdfIn PDF document text
    • http://vuason.vn/upload/files/waxerisizijoguxuko.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/st0rk3657q1lc568duv4olengs/81652489166.pdfIn PDF document text
    • https://10fci.org/userfiles/file/31558960401.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/2571823155.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jatemavutuvesosumaxan.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140caf0bdcf1---63187790351.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/536562591.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/padubudixawenoloxerug.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gijakaru.pdfIn PDF document text
    • http://savemaxint.com/files/file/6767009773.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/57914509680.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/75998696572.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mafofema.pdfIn PDF document text
    • http://signauction.net/userfiles/file/gojikobapim.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6c32m3mft091e0fq5ccos4fug3/xobijotegos.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/14589021232.pdfIn PDF document text
    • https://mauspro.net/upload/files/73104548794.pdfIn PDF document text
    • https://digireg.si/upload/80884333867.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 17756 bytes
SHA-256: db4fd2fca768008982a2ffa95ccd37c991e57d7871286b84f24b4a0ee70b9e2a
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10852 bytes
SHA-256: c92e2cd2760c54ddc3d4f8e06b81e07a168037aa371b5f2524006a842f344e8f
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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