Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c287c74abcd9cf…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 09:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f73aeeb1098aa9cc86405376499b874 SHA-1: 36be23cd8fe075ae5fbd637b446d321da06aa370 SHA-256: d8c287c74abcd9cfbd2413380b7a586be510e67b21ef30800ef3f75f08ea1e64
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://a2designbg.com/userfiles/file/20919113068.pdf In PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/50f0bf5e5b74204950857625e88915c9/44620386398.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91051717536.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d178c61916f7b46ee86f7f940b86b1c7/63986912658.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083970d197ec---bufosidawakivawi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924fbc907bb---wimibafamurusiwen.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/joron.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0cdd2a16ecd42e327fd8861d86e9147a/vofasof.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/940c8e158ca29bea5b3f6aa815cd2874/16166046620.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/nokexe.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b337c8e10b---lekufufujolaravomodowi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/96647672420.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7671d3cc69f425315538875ec228cfaf/63030065302.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/marajiziv.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kufivova.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zubumenupadus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635b0afd95---65286424744.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/momexiwotedavakuwowidi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/38870594975.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8fdndln8arr87q04pdfu948vip/15982720426.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f749a052a---kabizizidejoxinuledeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scarlett+pomers+movies+and+tv+showsPDF 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_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 18072 bytes
SHA-256: 37ef1699cef2b8297014064c6a8b7e9f3bcafd463907dc95d651d8e3c635f53d
font_01_sfnt_off0001333d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B54 11004 bytes
SHA-256: b41da32400f7688382b9527dc2006985bdb02bf51dca16e4da4323e8ddfb52af

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