Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f6ff60e7bfc51…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 15:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a238e35f69dc58858cb71694c551a95 SHA-1: 926f0c5a767629aba447a083f783e8a330b0fb7d SHA-256: 344f6ff60e7bfc517e66cf661a80eacaafeac80cbff7aaddb1911d890094b171
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. Several heuristics point to the document being a link farm, directing users to potentially compromised or malicious websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://priscar.com/documents/files/61918570160.pdf In PDF document text
    • https://ldoris.com/upfile/files/20210816015840.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/72043740728.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/1840502611.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/72154185277.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/34624882317.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d79d31a7a77e962d4708e7cd945f8087/37412906157.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nigudoleref.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff02b5adfa---21989751047.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/418031bd9f4e4b034f10f3e608ab2b76/wonabisezij.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jivoxukotaponukilekamo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68297b666---12343107870.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/67312399053.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fawoxadixogulexawotat.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/73049605743.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/64670404716.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/96685703386.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/14faae02cfa95783ac2d212dac87d3c4/29951408074.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/35623941189.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/libozulizupojilarugo.pdfIn PDF document text
    • http://msiutilities.biz/documents/gozatoso.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/92381408068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fractals+and+chaos+the+mandelbrot+set+and+beyond+pdfPDF 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 18344 bytes
SHA-256: 01cb000d187256ffe0f30b1bbb91a74ef6c8825889fef2c21e9e2d02a45b904f
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 11024 bytes
SHA-256: 79b892381b1cc8a019b55b8840cc7c74696306607474ea80680549e456b8301d