Malicious PDF — malware analysis report

Static analysis result for SHA-256 64768c245a88a34e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 19:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7b8435c53128be38fa9fcb17fff8014 SHA-1: 7df5eb0d9e4f8eb095fccaaac7289fd065efb569 SHA-256: 64768c245a88a34edc417a2cfdd462b8f6835ee59576661f3ac841039a644d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and compromised CMS upload links indicates a deliberate effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=newsela+article+analysis+worksheet PDF link annotation
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/aea7b4a00373ae07e03a78d12a7b8d59/lasuk.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607aaf11167b9---15126850137.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160dad9cee4aca---widirijisip.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/72fef6add192e46b0e460a6c1af8ceb0/82555809733.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/98078999432.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/seribexafujuzivegudizulu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e0aa5a4f8a500a7feebddc5e4aa3c3ec/85220747449.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gomipebunizidinogofawal.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/torixivuwurekibigidugon.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/bilapevuxepowida.pdfIn PDF document text
    • https://dineflon.com//files/63027876531.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/jowejatigodulokuxipup.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/66c3226f90aa6bd933faf616dc52bee9/75035598377.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070258854a12---67678270316.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/janexasamasorifobofekaz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1bc7e972---97490850788.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tolg058jchgu6ikth2vnuhipgr/52972921644.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/92607923981.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc77aca0bb4---53858511072.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/pototokedotiluwip.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/57349023683.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2ca04d16---78822087222.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082789333daa---nirubefatorug.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_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 16820 bytes
SHA-256: 38c61ef858adbdbf399cc032f0f50382c62f12b5a5d70dc423ef50b9d4624d73
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 10596 bytes
SHA-256: 14c0ba2d14efbd1aa557a6d37e8381af3df70c150e0bf6c2393aab485861021b

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