Malicious PDF — malware analysis report

Static analysis result for SHA-256 061cc8a4f6ce71a3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 02:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 205c8b465ec46215c890ef311d6f50af SHA-1: 6b5b5a224c64577269edae18f9bbb8562365b6c9 SHA-256: 061cc8a4f6ce71a36673c9704d01b0addf602f962c8c6490787d09098de0afbf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. This suggests an attempt to compromise the user's system or steal credentials, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xyr59.com/filespath/files/20210911220450.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bfut2bjf906dgh1g03fnqgo8lf/86314414513.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xitalod.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gozigive.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/gitisavezamuxotujolom.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///ritet.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210903_1A11977B6AF4FCDC.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361122dedb1---vozanoraribadugigibupunek.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/75583509656.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/88279853541.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zaduloxim.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/45362246988.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/21511757392.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4bafe1980ba693f6d7af108fe2b94831/dulosixonudisuge.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lavitebaxupotamu.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/56476082426.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/91450812767.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/12212273156.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/lumuwibuxapixugozubo.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/guvutalurazisulikamatimov.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161436a73a39ec---tanewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hide+software+update+notification+androidPDF 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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10744 bytes
SHA-256: dbbdc0f0638149b48a2a2be5abd3a80d03130d8434e410163819c462cde7c227
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 17948 bytes
SHA-256: 52e8b992ecd4b8f4f11ee5a2b4d730e8d78a7114e9c43b10c047d96b7831a930

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