Malicious PDF — malware analysis report

Static analysis result for SHA-256 09aacbc451374e8e…

MALICIOUS

PDF

88.5 KB Created: 2021-07-14 10:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3dd479bc21c7d0795f18ee8dd554a97c SHA-1: 38a2ada0d4d816ed27d6a0dc2f48aa6c18f16dbe SHA-256: 09aacbc451374e8ef7bc62eb9d062ffd5ad42b8b5c1f535fa2ef5622573ebb2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution campaign.

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://huntic.ru/uplcv?utm_term=clear+cell+renal+cell+carcinoma PDF link annotation
    • https://okazdedziecko.pl/_files/Media/file/xojanetidijonuwimavesukaj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1gd3r5drep5gont2qveupeqca2/faxalumuborigife.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed994a882d---97574082299.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/10428958697.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/qf94llqf5253rt5q71be2vnuhd/zobamuxezibugiwetewede.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/19795495359.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ddblihc0ted3o20fhmr92nqifo/43905587014.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/73318507633.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fetipusudumobakuvojep.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/7145e5a8e1a55aec4fde02556f9839b9/60362619792.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160759defb447a---jinapuf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b4a4593---2374774509.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d739f34bd58558f37ab703d2a696d890/56718589111.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5972d1ad0247432c5947ab9151bae685/sunixubirok.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7bd5b16af3b6764ad6c8ed3e035cf1ef/26608815844.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e425e69c---61939889449.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/4748107438.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/molarikuluvuluzukiz.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/zunixa.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/fuwefap.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff954b8b0a---47629621794.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8cbc8a32---28979723704.pdfIn PDF document text
    • 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_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10156 bytes
SHA-256: 114d4f47e425e0922c3dc1f6b07f16223500fbc8cc2851feabb50da3b6e28884
font_01_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 16500 bytes
SHA-256: 9a5399f488935138cf1655cd5e064aa811a0e3cb8413ad1dbb46f2f4b31decf0
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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