Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c8d7b0ab272e2f…

MALICIOUS

PDF

92.2 KB Created: 2021-08-02 21:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a57ff4173f70706b8733845127b6ce43 SHA-1: c9676d96fca8dc37cb75f2e1254e7356f0e14b04 SHA-256: a4c8d7b0ab272e2fb5dea392b87c520a1e811ac9bbf72459b052bd33a9e96d28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs point towards a coordinated effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://infrive.ru/uplcv?utm_term=ultrasound+guided+core+needle+biopsy+breast+cpt+code PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087816b5bf2b---jalitijagis.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/1919563069.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90e6497ec---jabaziloxedixuruvaza.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31608ed0f5c238a31608889285a31562/83315173261.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qn2c1md56muiakt07rsl7s3oo7/pobazukapozakozuwiw.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/12b6b6ba0162af358eb8175ce80e23a7/vekubixulusepez.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/sipinipawop.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/kafunejutimosupexogi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs69baa625omks1rrnct8vm970/76119738886.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a09bd47d---jufekevumokepama.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbb9a734e---nefevi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c3c6e3b42db44081f0455f4aa7ae0ad1/dajubukizevitiraxoto.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kexunovinaxumejaselop.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9af16cac0528ba895182b9f31f8beb8e/1240997691.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/pawawegeloxikejod.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/80678942904.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/73975322200.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/48653642895.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dtesvspmg8psuroru729cokjo9/bajubiw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/94910597297.pdfIn PDF document text
    • http://elm3rad.com/file/tijuvikimap.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/82867310134.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/nelonixajo.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/53051457955.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/11714591010.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_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16468 bytes
SHA-256: f8f5359a80fc409c0c34dc0c718772206ad990968d8a94669006197c517f060d
font_02_sfnt_off0001491c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491C 11048 bytes
SHA-256: a22df5a019b5407dd8d007a6d0cdf3999169c61f5e87242069814cae742f5cac

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