Malicious PDF — malware analysis report

Static analysis result for SHA-256 1370ad61d880db04…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 01:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67172d7e3e44621d06767d06438091e4 SHA-1: 35b314c5df88f0f84d66061ceacadd47b89dc08a SHA-256: 1370ad61d880db048dd1e93f6d2456f9cd23b689d377e3ea7fc12c7b2922be90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal that the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=what+are+the+provinces+of+canada+and+their+capitals PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f9e226ee405ae980becf81ab52a0098e/4779187090.pdfIn PDF document text
    • https://cristalensi.com/public/File/50803785383.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/xuvizevinuz.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zidakuzewidixejafez.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98dc6c648---5116518427.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/bulobemomepavule.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mavatigezolujulozafe.pdfIn PDF document text
    • https://senhewood.com/d/files/medixojipomilim.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/52625531796.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030416176912.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/kinusowefevazokutitemuxu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160727846aaf14---34378528186.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc45a30f7d5---29724022552.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebcd34e72---ximetezadilizizotazol.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/77687dbd925cc3c4b430ec67ef2dafed/natamivitupiridewanowipip.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160703193f23bd---jusizaropajex.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/60302628859.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/62756596371.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b0c58febd008c3cc7781ceaec2415cd4/78261643378.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/615f2dtc07bkepec27jhfb0840/86195950178.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16206217113652.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 10776 bytes
SHA-256: c3ffde35707843ab40802cbd6c24843bb9c88ee89c2141b91dca4822cc3b3040
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16696 bytes
SHA-256: a66030d6269caee40cb17461f3faa01453c248fcbda2fb5aefac135759b95020
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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