Malicious PDF — malware analysis report

Static analysis result for SHA-256 769d998ca0df9b2a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 15:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a526f4ec918a8bda79792c20a3e1c721 SHA-1: 8219daadbaea4ecc766111277939f8edc1446216 SHA-256: 769d998ca0df9b2a2f7021b5f4c1992b4373774a305a03a3f67f2f1f4643d093
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm and an MFA lure, suggesting it is designed to trick users into providing credentials or approving suspicious login attempts. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing attack that likely leads to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.rannatennis.ee/data/upfiles/files/gerilavovekukasadenamupiv.pdf In PDF document text
    • http://ginzaramen.us/uploads/files/dutebuj.pdfIn PDF document text
    • http://kaies.net/upfiles/210902025817855382kpy3w9.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/powivodaralidupuro.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/55678451568.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/1427296674.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/67170949081.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/63782504884.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fc75b2f5---7090645270.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xuwesemitoserinonesu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144833c65d12---fupuwatogufosi.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/18828428936.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bomexujevorin.pdfIn PDF document text
    • http://donghotam.com/luutru/files/78162266262.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94927c5b9---97014763179.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/lobaxapabadevudega.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/8168723691.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nuzupomedurowavezuzaj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/01da5d800507f00e4303dad9035c75f3/vupipinel.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24470193960.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901212011_lp7s9g.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/majafilokelimimunubajopod.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b68309fb19cf938bd20d0b03e703146d/11153810777.pdfIn PDF document text
    • https://penal-garazh.ru/files/71523020062.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/ruvegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=imo+hd+download+2020PDF 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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 10200 bytes
SHA-256: a7420b036bc6db9ea0fed7252f49668ec6d4946b46bfb0ee39a5567abd5986d4
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 18496 bytes
SHA-256: ec981f0291f1577ba746613fe2ffc8ac8b1d8f9e6817c467646085cccec01d4d

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