Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b101642bca7fac6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 17:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0e59762f502bd95a420c9c57cbbec660 SHA-1: 8eabf8d36f07060fde35d3b6ca11b05c8da19454 SHA-256: 1b101642bca7fac6ed7cbfe00cff3d2574a2c99a7e80e5cc08146da03c25ab6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised or disposable domains. The presence of these links suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inprovitbrasil.com/ckfinder/userfiles/files/gugavibotupibe.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fcaa2019---6172579703.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pawewa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11a41ea561---vipajuzetesomes.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5f757ef731dc8f626baf61b0275153a9/16448663718.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161222e4e2ec2a---saroturukix.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/11653312484.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0934rnh016v0v6gbo2an82shcf/tasozipenaz.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/84436131911.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c47fb699f85---40802627457.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7ca630e3---94914855868.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/kelel.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160708c70a4a4b---40723865072.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fa194a97cc6c7797c1ae855bd7c1f9b3/xibejosutinolexizilojape.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1htsb80l75lggvu4ppb6d5707a/wenobusulamixaz.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/memidoludugizulavixuz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1e40da7ad---6802463188.pdfIn PDF document text
    • https://777mto.com/contents//files/redidumowir.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/11313733019.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d9c2e436---56674815720.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/49uubai96p28usii4ig9giet36/76087814506.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/94055015211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=elements+of+agricultural+engineering+book+pdf+downloadPDF 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 17196 bytes
SHA-256: 937fbe701f2b74af758503f674f7d5328c931b1ea9b62762c9be08f5c9d26ba5
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 11364 bytes
SHA-256: 72ed8f7acc36013f780fd5cfd193d11a5b073afb73cdc5a4cf2d80d0c6c672c5

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