Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d31e64b676d9e8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 10:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43d81da5f8dc50ad2281ecd0bce4bc05 SHA-1: 7d0266ede07a5aeb74a7a79a82558502ac37168c SHA-256: 01d31e64b676d9e8fe258b35133627ba124e81e23350da4f2f0dd0e8b12ede5e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'link farm' heuristic further supports the idea that the document's primary purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=storyline+of+handmaid%27s+tale PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393cffda2f4---vifodupedewabekabazut.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/77721325373.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/92011821053.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/83228693739.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/33409322264.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676a8e82e0---fisuwelujijobater.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed300302a6---4046939669.pdfIn PDF document text
    • http://www.siposferenc.hu/html/17779413613.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juwew.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/kozunezilu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/l2nig9pjb85jnv1aicobforvan/95762192331.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eab41f8ca9a2149f464623a960d778e7/wumubolopamogisigupaxefuw.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/rosagulu.pdfIn PDF document text
    • https://frisch.ro/files/file/71413659015.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/robedapukojujikofefij.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/gixixomaremopesolofogo.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mobeluma.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vukibebudiza.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140309063567---zapipenobezigoju.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/95386931547.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0a0a66c7---13796460987.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b917ca8dd1---selikebo.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nowuj.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/93194130320.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_off0000b145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10844 bytes
SHA-256: 036a8def17d18a93a6043db4ef8b4683f9499bb74cf49e5ddf223e04dfa38743
font_02_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 15388 bytes
SHA-256: 5eba8733cb90dd54d2ae9707da26582a4d1255c08e3c36dbb25894d96f495c95

Open this report in the interactive analyzer, or submit your own file for analysis.