Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47552d205ef38f3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ed6e756f3b56ccae1f77ec61564da77 SHA-1: 5e57f4f6c4b52b8d5d20395ddc2b6f291350302c SHA-256: e47552d205ef38f39dcf535697bcec4bbac8d4f2eb0a5b8708856f27ea3338e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1r23osvn2nvi0u09ttfcqf3l67/34671513619.pdf In PDF document text
    • http://thegioituigiay.net/uploads/files/vanitapivuwi.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/88132968931.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/77543342181.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/43042964060.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/40193707121.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/dosemalexusojifire.pdfIn PDF document text
    • http://kme-kme.cz/files/file/35272871154.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/8106095692.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/5559856733.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nezuliv.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109100350358003.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/57172414871.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/61468766031.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/rejidi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/95d9b29d76733729f0c0c2075afd16ae/kepagabuxitixarubix.pdfIn PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cvhf3eta1qlg8k3cqrlkfvmck/dukew.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134fea0f392d---ramevekubarolalorenaru.pdfIn PDF document text
    • https://micsys.in/userfiles/file/53051673902.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/93547974642.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/55727504750.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/79060319105.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=world+ends+with+you+apkPDF 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_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 10872 bytes
SHA-256: 3b10fb3741dfded3014c795c27eb597ee08f7169f8466594d4ce1e2f0a5309a0
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 19564 bytes
SHA-256: 587d7833bf81e28f3ef5f5466d814b65720ea88add5fb66d628ef4c85684daaf
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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