Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f627f15a53a48d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-10 22:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3949f51154d10e9fc16021812e8d59ed SHA-1: 296e62c7c06a2af739d67af43d1fc578ed3ed9a0 SHA-256: 97f627f15a53a48d19e1cd10e0ac4f53f554fb9d1dde8ca804700f9fcfd13019
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, prompting users to call a number under the guise of a billing, refund, or security issue. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/88afa87646b805c56ff5ee6b37d15996/59992048306.pdf In PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zefuw.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec5d4005a---99299241254.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/kejitusitesarive.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/45926438791.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/66396518194.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090438295938.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/jexalixavo.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46210998367.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/ronifejelajomijokisijitap.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/87762494336.pdfIn PDF document text
    • http://bienbao.net/uploads/files/mifitum.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tagode.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/zufafazitopefezofim.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/vobatat.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb0e69bb5---42181211416.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kavidixuvisuvoto.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/demebije.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0be0802e9---59731867593.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/91014939404.pdfIn PDF document text
    • http://kaies.net/upfiles/file/miloregurasazuvunisazos.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/2958851387.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/83459873373.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/55113793272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+banking+app+on+rooted+phonePDF 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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 11032 bytes
SHA-256: 08558bae7fefd40bf591673e694dc729539d3213952326095822c49c197d84ec
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 17924 bytes
SHA-256: 1bf1cde9b501542dde31dd47f7897fc6f7a581b393d1c26008dea4343b0299ef

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