Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cd731f1e4bee08…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 00:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d93f784a7a0ef4fb0d483e9b132bad2 SHA-1: 5e2b55c858ab6edce69d08d86dc5b3804e680afb SHA-256: a5cd731f1e4bee08a2bdcc200e781c833e80dc70b35e9d289976a5daa7b87346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to drive traffic to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d12q73ia4ghcd6gs6eshe3iu2c/tiwedemetotasumaruma.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16095bdc7db2cc---95209810081.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/povodaxelojana.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fce98f408---kamedibafererowuza.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe7653071---buxafejofenamanubazu.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/86697152589.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dfd8d0ac5r11ol3lp8sg8l11j5/51519676549.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/15494972403.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/61172251105.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ead490a6fd66bf7d7cbe50d5fbbeb146/35467400206.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/fabakiguwo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nisewuliwa.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/87171723255.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c86d1d2aa---89789769959.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/jixutafizoxasivewi.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210709210045.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/tirezivinax.pdfIn PDF document text
    • https://ags-car.com/upload/files/36174573072.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b95569e49ac18922219a60f5f12c9412/607554913.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xapekokojusapu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ul9rvr9rmo1rf1uvl1n9po2s7n/robabutabusi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mukaxerevijavino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=motorola+disney+walkie+talkie+instructionsPDF 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_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 16588 bytes
SHA-256: 214a0dd689875d2af403fabb592ca2f41eada94aea712c2fe7458e6c847e13fa
font_01_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14792 10748 bytes
SHA-256: 830bb1cd83a2b490c2cad0527fb19c2ef04b0df9fd6a317c8514327fe85f3e75

Open this report in the interactive analyzer, or submit your own file for analysis.