Malicious PDF — malware analysis report

Static analysis result for SHA-256 3836c4fb2aa1f537…

MALICIOUS

PDF

84.2 KB Created: 2021-08-25 13:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52027c535cec1ac8a0480fd629a2356e SHA-1: efa1c09dca8ae92209cdaba2baf5870c3a672d65 SHA-256: 3836c4fb2aa1f537cc985f3efc61884d7ed0462699d8ac13eb9707367d0322d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=email+writing+requesting+information PDF link annotation
    • http://alibabashipping.com/userfiles/file/tezuzopo.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/generujazemenovutokeko.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2d224a3f2b241b0dc3e5f23fea49e46/bawaduki.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83f899f9---zekamesuxut.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/momogudiluneno.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/90078e005524558ccca5b6e107b7c747/sigowufowifozo.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/61187698619.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115390e6320d---lazumodokefoxepidedug.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5ef556b347610b7befc495c907d38b25/temumugegitadekuvajajifo.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/27231497883.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ba74e4f---65260617916.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/vufapegewazesilonepiwosa.pdfIn PDF document text
    • http://asqcert.net/files/files/lubifabipadavifep.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/73982165166.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/kamarababupakosepamota.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/8501713205.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/45284740294.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3fa4082d51325cc806d9fb1a8e27b70e/30890771033.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/gogizijonuse.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a645b4019---refajopakiso.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/99d6a8da44070b01cb9fcdbcf82d65c4/27637033274.pdfIn PDF document text
    • https://ibextrail.com/editor-images/leninezogatunawijiwizivu.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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 10872 bytes
SHA-256: 77a2d6a9e94234459dc7743e482e4ab30220fbb0b37c458eb0fe71ce90bde132
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16476 bytes
SHA-256: 7a5871146bb46a01d523ca29952284034976b05bd6d626c9f1f2af4df01aa22c
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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