Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f298631fe176985…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 18:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 752873b9c459db5c8268c58b2b7b7115 SHA-1: 0c7ae2e3dd9b57e6278381eebcd5c63eeb433b0f SHA-256: 7f298631fe176985dac6ba137723a4b1f64e3c681fa70c2235f3a244f650db5e
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself is also noted as having duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://lollanaclinic.com/image/upload/File/26425951214.pdf In PDF document text
    • https://guruvinodji.com/Userfiles/file/86076817304.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vejirufapeme.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/35137676782.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/tagewuleke.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/ziluzexudejuwuxube.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141902e0e369---49599888350.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/13099710492.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwigarani.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kagumiso.pdfIn PDF document text
    • https://ratoempat.com/contents/files/xanemajifezujijelux.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413e16eba71---jinuf.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/ladezipujomagigigozegiwo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6afdf65abf4766324199417662886b47/serizetulenezebipego.pdfIn PDF document text
    • http://alvitraders.com/files/kutapujebopogilaze.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/tenedapibo.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/pewevidegarixupurujepomo.pdfIn PDF document text
    • http://bakoca.hu/files/file/70901362965.pdfIn PDF document text
    • https://12tiga.com/contents/files/59468240408.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145fb39e346f---mepizafoteguroturev.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/fujovutaxowovewa.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6a9ae1599f157b443e2917d6624bd29d/81572992638.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/lezisawuzo.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090248589337.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/21523532095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+windows+7+mobilePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/buziwirilulapokoro.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_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10404 bytes
SHA-256: ec417d8268445ad90a7cbc38e2636931b6da7ad5979aa1ab532f8cd52b55d657
font_01_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16756 bytes
SHA-256: d3a239a23d7d720d4b0b1318dc23fbe024d1241fb828472cdf42f245c8c906fe
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1