Malicious PDF — malware analysis report

Static analysis result for SHA-256 be552adb6bc8d03d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 11:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4abd9f98bb197830e0e09056c6c57d8f SHA-1: 908f1bb366ea90835a1268d3a176424d4a907ba4 SHA-256: be552adb6bc8d03d0e1dac12d50527d0577bbcee807ef5836d7468a3cae8367e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with external URIs and embedded URLs. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=insight+intermediate+student%27s+book+key+pdf PDF link annotation
    • http://gamaxmotor.cz/data/dokumenty/zodavovese.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/30724377037.pdfIn PDF document text
    • http://stromzeleny.cz/file/medoxusekosubowifodi.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vosoluvej.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/loxijizatinekav.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e08f2aa17fdf02aa7d834be8c01b846c/39879993425.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/31061543123.pdfIn PDF document text
    • http://scarpatti.com/files/22862955321.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96314777968.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gulelopafadelulebijebul.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/8982646391.pdfIn PDF document text
    • http://parfumland.sk/upl/dapoliwoxijaz.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/fopazanizurulinoturif.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xofitenenojejuxowifewi.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/48676987672.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/purejujitofezurovis.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/18877132397.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/xewepotisuk.pdfIn PDF document text
    • http://gabortech.com/admin/file/lomosogodokewoviguzelezu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1cbeea1f34007f979d9cb145ff847686/fenafamesudexile.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131678a1cd02---tokexoduwirefel.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/97d2e946ab6a089ea542e1d2f8bdf9d6/taladipibuxozifugolikole.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_off0000bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 11332 bytes
SHA-256: e197c71ba6c2b6c953842f18df7eb72ad0387591e1947a865cc8734c7cff51e9
font_02_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 16496 bytes
SHA-256: e6f52a06d95acd4b413882b730d726c243d913a3e0ad88a1636d3d97259bf7ad

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