Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4cc536dbbd7e84…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 09:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a5ceb6a02ad5b23b8cf7ad3ffb9eb1d0 SHA-1: 491afbee0d90bab99824508f686d907678c1180d SHA-256: 1e4cc536dbbd7e847eee2305132bdcc5f9d3b399c05f1ed2ef437663c08eb522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lee-trading.tw/archive/upload/files/xejase.pdf In PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e79cfd6134cf722fc05ff8846e336acd/9377600109.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf121cce3c6---87022328862.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc41d310ed---zanenuzabanejemujatatoz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d9142a427acf866bee74e23f0b5854f0/nubasefibibetataduxapo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tm7oljejvqaqiothflee7a11ie/24643465302.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gawizodimevedatixita.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v4v58lnc10h2vfg8k1mu28l456/bewurokes.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b904e0df79d---roxefigidasufatuxafinoni.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d361e4bd05---40914602229.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ec55d14d9c46e02e616fc6f39431470e/jinorasumozixarot.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sanokipasumavezotifigop.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/25980114468.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/21b6d62d8ec3232150d19177e1fb2ae7/31074902188.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/turobol.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/79d368d3e1fb632bf967263c86238c79/gamodakokojukupubug.pdfIn PDF document text
    • http://falerisztika.hu/tmp/40318490107.pdfIn PDF document text
    • http://anpo.vn/upload/files/wepafusebixow.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/fakubuxumadepozawuwe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3579a313ab---donelefejon.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/guzuvulafikeduzazonasu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2b382925---91683142129.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/985625ef0033366cf04b95347617b081/liriwidiniru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=demographic+transition+model+graphPDF 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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 17224 bytes
SHA-256: cf5367c2edd177b182e012e4e5d4ec868f647d26e7e69aacc67a7408d88d7df3
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10964 bytes
SHA-256: fb81cf9ca71cb329d649594b50303f04de74ef80e104c620e09f88e88aad5509
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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