Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e14ce578bedd8…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 23:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0de413176d78329c2172c095b0d894ab SHA-1: f8a1d5cb00f6df1d516ac98458f1d3cb76a2276c SHA-256: f66e14ce578bedd8f95e07eba93b213de2cb1f175ef2a0bbb0d33cb60224c9d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malware or lead users to phishing sites. The presence of a fake invoice lure further supports the phishing attack pattern. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://orangerun.re/photo/files/91153620951.pdf In PDF document text
    • http://haisushitogo.com/uploads/files/1439890031.pdfIn PDF document text
    • https://daismene.it/file/ruvotemubik.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/92313069861.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210714_054643.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/rewubusape.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/62e00d7b7f7b985f4830b5eb89ddfa2a/vusatot.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7ca19b5f---juzukiropapumikunobovo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab31bafad1---redujazazavefuwonenifelul.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/32751655466.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/51379855836.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/lepimirafevodezuxilituja.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d99337ab7---supagevonuvazeje.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/piwowaputilasuposav.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fc682b0c9ee9c3ecd8cd707663a60151/44091440531.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/82729320836.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a1d236ba2fcf2356096dc32ea2a4e30a/34392841996.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4cef06dd556f80a875c719651577b41b/finowojekibuput.pdfIn PDF document text
    • http://www.bandungmesin.com/file/11715567984.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wulavabesapeninujebos.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/58e859480de8b51bd514997e44bd39b1/fejuxokovoxonigoraji.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d077950a3c---95807036820.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210803104900_1yctk8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=trados+studio+2019+manualPDF 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_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10804 bytes
SHA-256: ea680b02d34e3fda981342287f08427f680ce1dafd331aba4dcc37cf41fa1db9
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 18828 bytes
SHA-256: 960156a31e30003b1a425ae199a3f7bed931ab1fca02826e7e94849f916a2777

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