Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9fa44e9064c910…

MALICIOUS

PDF

118.6 KB Created: 2021-06-23 02:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ab4c626cfa1825b23bce66c6291d2d1a SHA-1: 6618aec3bf0872a45d872c76f6cdeb2589d8af20 SHA-256: 8a9fa44e9064c910c90d691980c811aa155e12469d64435fad6b154406412b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://koffiewarenhuis.nl/app/webroot/files/userfiles/files/36090366606.pdf In PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/86031140035.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12adb7b16---wabovefa.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/mejive.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/gufeveweninudewom.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_5a9bd.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4eade883829f4637f5e24b69899a0bfb/vitibipadozejuruki.pdfIn PDF document text
    • https://hirurgija.me//files/64987795091.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a38b6cf4c---57121506547.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0906ebe---57767691862.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/mejipizizukukegidimujifi.pdfIn PDF document text
    • https://nevisnews.com/userfiles/mumekuzenebupej.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc2e0b5c1---wasejubunupuwoxez.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcf226b62---18248630109.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/lugodafejedeliguguvavipug.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cef54d7f7---rejivibosiduru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=weightlifting+fairy+full+episode+tagalogPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 28368 bytes
SHA-256: 0e1db357c2e24e1005fae13844627c6d14c4423cf8f17eb34a7b67780c4e618e
font_01_sfnt_off0001677a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677A 5300 bytes
SHA-256: 885d7d3d55fb347954ae75f2e8e98bd82e822560cb0ce11035950818d8b9d301
font_02_sfnt_off00017986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17986 14768 bytes
SHA-256: 4a207ba6a75c99e2eb94d4b12fc47a0b087a1166b463029546b65986b96ae658
font_03_sfnt_off0001a749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A749 16208 bytes
SHA-256: 386b790d1d9ce13b171fa75da4b230246976ad5417fcb3c45d956e9311ee73f2
font_04_sfnt_off0001bca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCA2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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