Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8434912f568551…

MALICIOUS

PDF

90.9 KB Created: 2021-08-28 17:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91c015c8d8cb6f28aad90cbca3a6a781 SHA-1: 7236a1d70161a7e6236949d07a718f3421d513d3 SHA-256: ad8434912f5685514d6ce85a64dbdc12ff748153aa9b81b24757d66299c29228
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mamo-tato.ro/userfiles/file/62392254206.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661bbc3d17---noberaliru.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/kejijodawatizapibeg.pdfIn PDF document text
    • http://wawa757.com/uploads/files/89214226205.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/waxamafagud.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/falewibemumaresaruve.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7735990c6---buguvirebubow.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21ed0873e54031d0321538450ef893cb/totolamisubizozadara.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/lofaputesefubonubifuvo.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/88589235187.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/rizuwusasisipelinig.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/334d5534fd9e46e456dc4e1fefb2eb10/70808530304.pdfIn PDF document text
    • https://grouptm2.com/contents//files/datideki.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8062ed60bfb0d3d25548c8b348bfee75/sidevifo.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210826_2C26D4E43EB1FFE7.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e874f5e0---44968008035.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xezadinolumunuwilidek.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609550d4aa620---gewufofatupajage.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/63534690709.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/25844909190.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609739615d702---24620884006.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/zaxuvijixavobidege.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210818_30A4DBAD3A04D282.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fjs434dlpp0r5l6f6tb5p185r6/funivepebazilekep.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/lurifefiwumezivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=participant+observer+researchPDF 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_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 10632 bytes
SHA-256: bc7e7d8d6ad0c3f12ecacad5536f88f676685d4721a909b99dc1ff2ee6c41259
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 18468 bytes
SHA-256: ec8ddd8a46c173f4c6395ed3b1ccbd6d560c3df11f079f4c43e0ed6e6a89a447
font_02_sfnt_off0001453f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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