Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fefe8800f679b2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 04:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87e6e44921928930413f305de4ba9b08 SHA-1: d716bddb9657ca97de3a863ab9ba8e56a663fe01 SHA-256: 33fefe8800f679b2a2fca0aa2ab012714013232e9b01eb61466743d09422a2d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, and the presence of embedded URLs points towards potential exploitation or redirection. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=online+distance+learning+platforms PDF link annotation
    • http://bc-arman.kz/ckfinder/userfiles/files/boreguxujatesus.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109070250305994.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/66187471214.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/netotupod.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/57460330033.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/38121931798.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tarebeputesudezezatoxof.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/58585810604.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kenefasun.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cufpf13virqcloppmo5uofkjju/75405245710.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fevazezawerasupalevexuxu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/379891930.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/69174609387.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd5d4dcfb---34463527668.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5dd2f2b6---97916435189.pdfIn PDF document text
    • http://aurora-c.jp/files/files/xogadezetowimugumebasib.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/nenipopi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/judimakaxera.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/sugegas.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/20075274779.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e05fa2a0f---sodav.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/pusodalodotetap.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/16075353420.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109260234053120.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mimidifaverudoj.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1k54tu0djm23b78ive7847tr1e/dibonajusegonuduzesijez.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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 10988 bytes
SHA-256: be8414e60014477cce83a2a27b0b91c2c3920aad0375df720b81b25242191761
font_01_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16876 bytes
SHA-256: a11f7b9a6bc470e61f01b67c18408716f79cdc3a9a0ffbadaa7aef62e9b9209d

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