Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fc8ebf85ca164b…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1ce8c1f338414b963c45bf457286c080 SHA-1: cf5c23c3356f6253fe87f5e740afa555588042ad SHA-256: 75fc8ebf85ca164b43b56331151781edd11c224a192ef7545cdd520a5cb8cb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm directing to numerous websites, many hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahchala.com/img/file/vififibom.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bn4iueohqknc1om6p85c357rd5/lofofetus.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe86e24fd---kosekowa.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tpsuk2onsueqecvjm0ivud79ak/96942452085.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/94660387157.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/92fb3e4e150a698b187bec7125fa684c/xodibujis.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/zesuxukefiritavu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/losowotanikoze.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/2052464182.pdfIn PDF document text
    • http://abnicum.com/files/file/lolokupujutaxebemedo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a0b70d383---wupupupirexawuva.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215291728183789.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72c6ed00eacbffda4a76a6d81fff8de7/benuvap.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8a7ec171---gujujivu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dec8d5056---60371919343.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/52717588643.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/40099875806.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d71239278---ragikufopumowegad.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/79247144037.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/65305805335.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0lt70ho00p16bbpdaaipp6acsf/24151349328.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/meranuweroredi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=favored+nations+meaningPDF 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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 18192 bytes
SHA-256: 2d1691a249c4de26a2bd43713af928427e6b5da35b639c3b13181951f906ecaf
font_01_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 10588 bytes
SHA-256: cadcb041441cabdb58f66c176ba305a4b2aa2c826352bcbfeabb03808e31e24f

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