Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfe6f00884f9e70…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9b7de5072e90e280b7b0450b40d1992 SHA-1: 3b5d8594b9b02c6dd65a64949aa2339dc0123c38 SHA-256: 7bfe6f00884f9e709c115a1e2e8668283b5f2212d0238adb361558960e89f970
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links and the high confidence scores from security tools point to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=faringitis+viral+vs+bacteriana+pdf PDF link annotation
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/345258de1ace7d375dbdcd591c17913f/fuxalab.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0163b9a46d---78792102820.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wiwopomekeviripevakupev.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04b5eab00b---toxasexefuwusi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/litado.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/99243796773.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/61803604489.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/55756066344.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7f729f40f---11420336300.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/rawizunisituxewasari.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6vvvv50heal5ao4ss9iq20sqf7/jagelujudesoxajatu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8e954e8af25bb9ff4b46f5e5a99bce0e/45877374879.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bamepedixaferipilaxebov.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tovasaworuku.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/79423928107.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683a139db3---16468390741.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/27664656727.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mmguj4caoem29iiushrti150fn/tevevisinaro.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/99868573519.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/xigenijiw.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6a2abc9---57715985572.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/25247201599.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rusogodokedobopu.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/ragomofisavutiziwuraxabix.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16912 bytes
SHA-256: 3aea1dd61f22767e6e669ce0f6d8a6d25f9c47f9a51797cb480256e8b21201e5
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10860 bytes
SHA-256: 8a482bd9af81a66e8dd70e2963ddbb154fd37ad44d3411156940201e924f6f3e
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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