Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34ada85fc0c95fd…

MALICIOUS

PDF

97.6 KB Created: 2021-06-13 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 675c5f380dff68d80f4432b057fe0a72 SHA-1: 504f061ec681c795bc3ac2100491cc7bee92a7cd SHA-256: f34ada85fc0c95fdb4b17ecdad8ee67de596268109eb56a345278018eff40c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=coc+town+hall+10+war+base+link PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ba7cb7e6---12064418447.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/luxeluwedewudajus.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/ropurinupemoluwofuf.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/faror.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48b1c86b47bf79e0e5b69e1b750fb4fc/wijuzikefegititaxol.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/biwusakuperiguda.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tusimeboravobuluruzo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/sepotubum.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d713cad0---42302057577.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d317fa0403---gizajavovukafakelawi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qmqhgc2qc3egdov9qptoc0k8kn/bewipebubibinawupireb.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/79109505539.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/47249518606.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/45981559941.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e588ca8c---xovafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 5284 bytes
SHA-256: 21295918d22e6e682869c0bf0f75975034f3581d16ccb0f56a1817309b8e30d4
font_01_sfnt_off00013f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F09 10924 bytes
SHA-256: a233aabe11d6c0a7de0aa6c5d28ca0f7d4e511b7fc6f4a37b83e48b030f15a15
font_02_sfnt_off0001640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640A 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073