Malicious PDF — malware analysis report

Static analysis result for SHA-256 19930155372fdfee…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 15:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76344f16cc6d79f83eb42cb4d3c10717 SHA-1: ad840f2665af3ecd35a8a910ff19f1c782dd8d2f SHA-256: 19930155372fdfee58efa7ac38d923e4bd23419a00bb24b2d3fb20e242b1a94c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=how+to+follow+up+with+your+network+marketing+prospects+pdf PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda4a1eaac---duxamixon.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611388ff8a753---dutowijojoz.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/nibusipejet.pdfIn PDF document text
    • http://fitviewer.com/files/file/nuwejatiravuxifukobatet.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7ea98ba6---fovibapugusuzojofe.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/fepulefamasejewokagamaz.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gutakawanesosamagodez.pdfIn PDF document text
    • http://climtech.com/files/files/bukutumefojifamafafufa.pdfIn PDF document text
    • http://hla.vn/upload/files/12989243192.pdfIn PDF document text
    • http://bakoca.hu/files/file/66290741382.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/mapurar.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607358de1fd91---13992280989.pdfIn PDF document text
    • http://108homed.com/userfiles/files/vavosidupu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/83683333496.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e22fce642ff---66314970717.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608631feb9a8c---15947086901.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9fe5333ccb9b77c048982eb1a42719d0/tifitolibiv.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/bivisasemidugijixafibak.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9332d7b49---71530146026.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079e24fac937---78569507403.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0f4a790b---tojunukujajonudamebenuteb.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wababidazosirozukit.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7abadae5---josubilaregufopusoxik.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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 17548 bytes
SHA-256: f6feedb07b5c7a89229ee7d8e74a9d88b50b9b3df81a874725cad4f6e830c453
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 11448 bytes
SHA-256: 011a93262feecf8978f32f75c41f2f73ee6cb38f83e065bf62b07e62ea9aaf23

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