Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fae2593163e43a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-02 16:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c4bcfcb69c688bc1bbbdf5647e58f1e SHA-1: 1759b22760c057d1f88e2d1b899f3885d5d9b306 SHA-256: 37fae2593163e43a8ff25403eee5bcd7dae3c5a2e4f6b019c0f9d3379b1c8a35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the presence of link farms and the overall structure point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://elite-nails.pl/Upload/file/64099570094.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-15/20210715230226236508.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f2030256ba3---26520110673.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/46466454409.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/90066991e35cfd0dbbb2c8ea95c10453/464251658.pdfIn PDF document text
    • http://technocom.pl/editor/file/11930219094.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/q4322bauus4q2b95jurpdkc3o2/27065865921.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/43301433890.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/51763997427.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d729b2efc---96763370497.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/24746755725.pdfIn PDF document text
    • https://plasy.com/uploads/file/duzemesasobakis.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/40348791843.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/3595014392.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/tunimewagufitopibezazaler.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607837ea1f5cf---pixazuxividiwabemafomupa.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9183650bf173c5fbf11044c7f5d0e4ee/68757884923.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758593f539---61959232444.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/davifovewekusorexus.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/kuzukike.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26490d0680---16810497571.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da40bc5a1f8cff5dd273e75208a27dc8/balofidujejorefomokafafo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e376b20d---mukavukakojuvagito.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/vapenurigagorune.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/47627306260fa0da41194d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=volkswagen+transporter+t4+service+manual+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_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 11352 bytes
SHA-256: bc8600d1e0c3f81670c059273a3840ff2560468b9daa3204351a38c369edd9c1
font_01_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 17876 bytes
SHA-256: 66ba1277f8124db0dbdbce03a1f443defe355550f7fa0eaa76a4b75537271bdf
font_02_sfnt_off000150b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1