Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d53f3556bcbb8e…

MALICIOUS

PDF

97.1 KB Created: 2021-07-17 09:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c508177cfcc8a43821f1ef8c0f705c5 SHA-1: 5ff959cf02e04a7ecd7ea8f4e9c655ddc69ca3b4 SHA-256: d0d53f3556bcbb8ed35db405e91c5dffd0ee0b64fecdf536a4216a723b732fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The primary attack pattern involves luring users to these sites, likely for phishing or malware delivery, and is associated with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://jngf.cn/files/file/66438208895.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755da89335c---57401253636.pdfIn PDF document text
    • https://energooptima.hu/upload/File/repabimorigaze.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bb5d1b6d7a4fbfd24b0eb9928de0ffad/fenarenofopelitidi.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/33666837960.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f77763c239dc1dd2e31a1dc1d4d68e2d/depananuzumanoponarivun.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5c2541942eaa14d2a547b7c18fc0c98d/boxixifevi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa31afba3---33996327404.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/zabuki.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/17664407137.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/budozof.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nrf89qpk6a0pkrcejtu0d88v81/25165768440.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608192a1e43f8---lanigofiv.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/eff62c1cc54036dc65a541a50bf8d80b/kibizekoxotixu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727f9b1066---83229915250.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/49348462390.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/73916942468.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a303baa702a---65336181964.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/99326473831.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1430c2f44a---87700556365.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b939eee1---lifegux.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/pajefigizuniv.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/juzezumupopufif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609883be44eba---bajuzowirutufalineta.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dd3db2eaf3319814ae0818f1a4874935/dojezotedakepuzab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=laugh+your+way+to+a+better+marriage+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_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 11024 bytes
SHA-256: f4f5919a91ede94c7067974aba58a26bdbca529901ae8ddb1964b1a24f1e439b
font_02_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 18096 bytes
SHA-256: 108487aa635ea312012990f6fbfa02e3f21de68fd7c97d3a8eac317075c066b3

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