Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fe391ac7e703c9…

MALICIOUS

PDF

157.7 KB Created: 2021-06-28 23:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d64bd50da435fbcd187ae5bf5fcf771a SHA-1: b179eb76a14bb042924185c4fb9c5b9c13328a52 SHA-256: 76fe391ac7e703c9bf7c0ca4d254ca373f58315f8daf3585dad217c4e06ecebb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with numerous distinct hosts and embedded URLs. The primary purpose appears to be directing users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/30m9hd6omqqtlj3ria7kr2ub94/24204079695.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/pasadavababofemesuzi.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/1323830971.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ff1bce6ff6d964811da648b404bd6d1/nevoluwigodupofeg.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e4d662cfd3bf6434dda0f860f2ad0493/12991694433.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760bbd58ced---kazaniputajifonod.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740dbde6efc---morazuporifetut.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/2420177296.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14067e5e80---79663130024.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/67416368034.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8d7314a1eddc7f268500a164bb6789c3/wafobevituxinuxozowikezo.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fufemikunisedofomibos.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/61fbb6b72a4ad35e98bd0a089094a06b/47400794132.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/92h6678vo48007gbjgl60kvs6l/zaxetagutifagiboniwut.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/netex.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160accb9573ef0---rekalevinazonopir.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c7fa3eded382e3aee438864a0c49a727/25621503650.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/59658404873.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160be4fd31245f---2478043175.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c3f42aab3---lumifuxotalam.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/83129493912.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/39678225741.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fefifeponodik.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/uni2fbitgsru9fgr0m2pp0ktqs/28258650712.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779548591da---65941709841.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dcc859f61c0685057cbf6198cd0adc30/tamebujugafefot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pharmaceutical+sales+interview+questions+and+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000203cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203CB 11284 bytes
SHA-256: ca46e079ba4724d977290a264f2b47cf728a3f002528228ecfe4b600cdd8c153
font_02_sfnt_off00021df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DF4 20272 bytes
SHA-256: 7eebac102ccf732a31172bf267bcdf765ac10aee8486423ea7f48a9499aa6b8b
font_03_sfnt_off00025265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25265 16204 bytes
SHA-256: 22dbe61a7cdc5352a071fba1ccc9e2cb9c749832ff22254afd73b79c00569a21