Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef82ab7e1e75e18…

MALICIOUS

PDF

102.8 KB Created: 2021-08-18 11:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2c6ce5609023725bf00c9d25061d7f1 SHA-1: 022882755ffb72f9275e8b75eec877908bc53df4 SHA-256: 2ef82ab7e1e75e18fc5b7159bc24d28221d4cacc2b9b0fd6d99613b4f6101f9a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082623ef3d63---mubojomajofamenufijasavo.pdf In PDF document text
    • https://mps-india.com/userfiles/files/fizofun.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021623632568251.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b82a47e98---kagopekoxorutuditeginoke.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e732e11e990aa2388cdefe96ad6ffec9/rukarekoxudaviretijeb.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8605d529---bavikukemit.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/98684523072.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/47044742996.pdfIn PDF document text
    • https://isleo.com/i_photos/file/jerofixejikokuzobeta.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108e00d0a5f4---51959453485.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9386153d4---47771632706.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/33509747242.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7cddab1993912784fee015a9ddd919b/zewezunesixomal.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926b869b769---66515528078.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/laxubowodowopijusidos.pdfIn PDF document text
    • https://icbacademy.com/upload/files/840627314.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3nvth84t8nmc6lb2i5d95ou1r4/82302727712.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/np7agbv0p50trffjln4m71if2l/81865662852.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6cjk12maheglkng6fbvs71mnua/8249856584.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/59495300272.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7abffdd8cad3d691dd1551ef09d1d4ff/miwajuzexo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sosinagezepugeposatiti.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8vms419sl3970qdtr0h2kkk2n5/dadijifavivu.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/89261112272.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/zamutilafuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=you+raise+me+up+violin+and+piano+sheet+music+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_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 17360 bytes
SHA-256: c98c11d67c52b5fb854c2b982d99c596a87ff225ad7515f17be5de30287ccc93
font_01_sfnt_off00015876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15876 11036 bytes
SHA-256: 39b253f88a0053c1ce5ece6ea456441cad4cb5c91ce16af4f3f325f84f8ebdc8
font_02_sfnt_off000171ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1