Malicious PDF — malware analysis report

Static analysis result for SHA-256 563eb5ce9d35d547…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afd52e08c9c7c28bf148eef270a93a81 SHA-1: d030a87786ea02fec4ee12f1164783bd6c646ffe SHA-256: 563eb5ce9d35d54734ef9fb72d5fbc1c0dc675c47a6f8030dfb639f07f466068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, making it a component of a larger attack chain, possibly initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=lil+snupe+meek+mill+freestyle PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8fb2a88e---26531827146.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075922fb9ba3---56990253345.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62614df66---30093687951.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wisewuvojejutejasa.pdfIn PDF document text
    • http://minerva-collection.net/files/files/rurogixuvawokovibisasebe.pdfIn PDF document text
    • http://sun-eko.eu/files/file/30193623292.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/71775471268.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6a7dd868---sepeputoxuvifijom.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/waritoxoza.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bujovoj.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/vilepidexizovulavizikekan.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/sudiferineb.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/98881020541.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/62443596623.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160929e4ee6992---9379901195.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a6ea3b41---87318081143.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53888421761.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79fb2e3f0---jasigomodima.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/976f4db0f18b07ce652f60b104c28815/kokemijuvarikepatutar.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/56864269968.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4256cd814a---32661441300.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/gamafalasuzava.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/33675633904.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/44778831686.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/29114740793.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 17860 bytes
SHA-256: 35dcc84bd9905bcd70d3f0a77c34878dac1dbc889beaf40d524127b459846077
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 10500 bytes
SHA-256: bd31ab2132cb36f2b8e1076c5a2c2486443d038d9fa07a48175aff807dad60a6