Malicious PDF — malware analysis report

Static analysis result for SHA-256 5684c927af3032f7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 16:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e384399fd950dc3943d34ac0d3023a05 SHA-1: ac5e8e49f45a461169f2c08a6c3e0f2fea3f8322 SHA-256: 5684c927af3032f76fdb3f9283c827bee9a4af2372ea93e0ff14cd6287c8bd27
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tinhhoaxanh.vn/userfiles/file/neratogebu.pdf In PDF document text
    • http://talleresjpg.es/img/file/76501286957.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kukorutob.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070857b5fe38---fagexarakanifozakexa.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210630175536.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cfbedb9a---zizozevevipazuvaku.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/47007662544.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc6804f477---nivekovogitixuzumefulu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8bb1f36a5---nasabefidavufabubojiwuwun.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31752848244.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/purofenulugose.pdfIn PDF document text
    • http://malifer.hu/upload/file/xepeximi.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/5064075125.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/61254483444.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gatopadipele.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nuribexafejis.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8904341b---jujofinoxupu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c90657a0e60e73c18aef65a80fde25d8/65757403364.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d973d19b360---50815146939.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/rifitimominam.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/wuxenaludawipebeped.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acad99dcf9---30959710327.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/xipumulonatagovuxokivuwuk.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o8r6lkaef5qs2bloh996ckhph8/53396220429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=luffa+cylindrica+pdfPDF link annotation
    • 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 10268 bytes
SHA-256: 94127146637fdbd9fb35e7706dc2f9e6a9c401ae9a28905701084886e653b4b4
font_02_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 19788 bytes
SHA-256: 726a7cf506b26d4eba0a2cb784dea0c4e59f7076a0aa605514166f35d66bf1b7

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