Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d8545a4e5b44fd…

MALICIOUS

PDF

114.8 KB Created: 2021-08-08 14:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee0baf08aa6aec51e34c68b712cc4151 SHA-1: 2cec6c302fc026ecdfc5c11c049f435180c8cd38 SHA-256: 20d8545a4e5b44fdc462ad95d84e01840218fac67d99df9e3ae8e3c277ce8dff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://catamma.ru/uplcv?utm_term=what+is+the+most+recent+acls+guidelines PDF link annotation
    • http://brandnewgoods.net/userfiles/file/65752012093.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/82694884456.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08250f9f4---punuxoluge.pdfIn PDF document text
    • https://x-software.cz/data/file/mufupiwunegogod.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f5444878bf6a43ca92c1b681a66f560e/rosixepefi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/nilevewanibitakixub.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8gd8onklldganu2loja6fljs66/89390007296.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/72pj17sg84fnjlb4tb70jfuc80/sixafotolenarudan.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mevabav.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/69505606878.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nnddud7s8tm39qo3r3llj5jmf1/48273654295.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c72c61437---57170482759.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/41005453316.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b001eb739---31350953401.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/karatixadezeve.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/11627966579.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/subeponogaxis.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6eb5a7bc16026e0e21250292ac647f69/bemesalini.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e5a3bee2---wukorakix.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160778367e9ebc---pugewezajavixateva.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160768ff738156---jafawukifazemisawusekimol.pdfIn PDF document text
    • https://tigaintan.com/contents//files/40181875576.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ead8e06e0db37672baa85824308e3c30/mafimejubotodujafe.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/68a4b0520d53e790a15a3813700eebf0/50814481755.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/4491282720.pdfIn PDF document text
    • https://themalc.org/files/file/jezuxulavusuv.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_off00015e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 17632 bytes
SHA-256: 182f10c6c9ee1ffaf6e56d38b7305c699ad79633dc4ca65aa5bb0e5369d13b96
font_01_sfnt_off00018c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C31 10912 bytes
SHA-256: 84200ac3085ead5e43296c69206394afc0f5bec81de295b36c2d2a922e95f62c
font_02_sfnt_off0001a514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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