Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d188f4e2b976961…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a89ac4f13a3ac95d0688b742cb84f505 SHA-1: 7eddce774930674c8b09712b46e00bacd42b7d20 SHA-256: 6d188f4e2b976961eda636cd6d22de7f9d63eafb75c15bbf908fb3fde73f8064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://irlanc.ru/uplcv?utm_term=minedub+recrutement+2019+pdf PDF link annotation
    • https://haciendaloscipreses.cl/upload/file/buxifa.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/lusupogulutasenotagavuz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612caa37623ae---xowawowodukokedokafituvu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kifep.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fawebopodef.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040488fc79---2474072017.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/vijadisadeviwazotewered.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119bb132a859---89003031110.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7f196b3f1b008255dd06be6a135dc5f9/dilikomewinum.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078581a85ca3---71437377969.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611414a9038c6---98768941367.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bdc2adf651975fe20f874b603cb46d3e/9365294830.pdfIn PDF document text
    • https://mszukam.pl/dat//file/52740238557.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ff969de1a147234a82c56eab7b96e314/fulimapolisapidogetedu.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/lawilofotitusejogew.pdfIn PDF document text
    • https://sambelteri.com/contents//files/banazepewukimi.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/34719598518.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/zanokimajokabinekaz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a8f253abd3147da0bdd4e50dbf19844e/84860907283.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/13319863501.pdfIn PDF document text
    • http://freeski.hu/freeski/file/kubupoma.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lebalem.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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10980 bytes
SHA-256: 02889713298ea21cc3480bc403d2120066b346023ee2d09999d08eaa7a482408
font_02_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 17396 bytes
SHA-256: fdf929e22eba2f839303e562431e03a5528d661cd93b8acff66ad4a5c20af7ff

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