Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d52e1caf35d594…

MALICIOUS

PDF

93.4 KB Created: 2021-07-09 12:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b3646d82b4458a54ae4566f4942d5a0 SHA-1: 3b0cc9daea39ab38536845fceac16fa174f01f74 SHA-256: 99d52e1caf35d5946445c333c37818dacd465fbe79729f1b492c59280919a0dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://businessservicesuk.com/userfiles/file/78536843177.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a6daf5d5---rojanujujipaxagi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f296e2b72098ba1f1e58e32fe80c345c/sovikikesowelutebije.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/60212106612.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776044d8cc1---xorefuz.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/3304842912.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lexenififuseg.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xoripanadukosa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085852c6260a---50427517587.pdfIn PDF document text
    • http://fedime.org/imagenes/35911034116.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/tukelevutali.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1ea0757dcff232faa578e150a1919c2/74285149294.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/7763f05bedc0b99d2b1323f15404fe8f/mulebomipazevosus.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a4a4fe4dbd41b42beb44d9df8d6f4d97/runedorubozovakex.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d410c5284b13902215492fd573bd72b/ribux.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jupoxukenesoxisagufutida.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1945577ae2f2a117b6b410b42d8f9e0f/dilupaxolon.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ian4qeidopbrp0qk6o8chr3307/1140536597.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609995940fe37---38262693769.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4acbd97772cc09d1d31fffc6b3137722/redubopabexobojadukiva.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/65713217792.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u7v8ldjlrgq43jfh8033r6tv1n/94832961004.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/eac54ea7bd5ee8187d335f0fda3367c6/62244257361.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ecd9883317c20eb55bb5097d527e02e7/kitipojaxogiw.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/baxeribasupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+know+if+a+function+is+an+inversePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17452 bytes
SHA-256: 5bf530564b276d514e9e7a97c6ba08fe5788619188d75ecbb4db9811f40ca366
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10616 bytes
SHA-256: 0ef1002e06c38fdf9dc779ddebe661de30bd8db0d2a2585fabc814fe43d0b9a8
font_02_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4E 17532 bytes
SHA-256: 1588a5c0cdbbaaab73489238d2c80399ddd7e5fb1787eebbf7a8f837425138c9

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