Malicious PDF — malware analysis report

Static analysis result for SHA-256 79198c8ab93e250a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 11:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0067da609f13c0cdee50c1e41104ebaa SHA-1: c4341c645646af30b31f048249fdc672830241ba SHA-256: 79198c8ab93e250a4a046622fa9d443c19ef2a7d43561b6c6912019cf531dec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure of the PDF itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/de795134edba69e0b3e22f4177178800/61404376535.pdf In PDF document text
    • http://kochamsushi.pl/UserFiles/file/zijezadupogifizuso.pdfIn PDF document text
    • https://apizf.org/public/file/44786867459.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b13d0d5e9daa5c1ac3bf6c05c8e2df73/xesisejilajubir.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210816_4863580DD0C403BA.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/nifogolixizadamubusa.pdfIn PDF document text
    • https://beaszemin.com/files/kebovesafupi.pdfIn PDF document text
    • https://linardi.ru/files/file/89374782136.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94548560e---93448530811.pdfIn PDF document text
    • http://htwy.com/upload/file/38061228140.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1aef6d985---80390782888.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/64041081084.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/medafesusoxabekajiwesebog.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924cb84a895---zajinere.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161073cc75ebf3---60587395305.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/3nea2c6utk5tel3fgk0jaqp8kv/55744014123.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/44011126788.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9a3066c8---tadize.pdfIn PDF document text
    • http://yuha.be/_files/file/91419720229.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dba7d15d---numiwokapexunupugibod.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47e842f35---logozirot.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/62712393167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cazadores+de+sombras+renacimiento+1+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_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 20068 bytes
SHA-256: 1dee8aee80af3845ce6a60bc0b76265d8b46e76c5e4d1a43ec04e062250c6f43
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 11016 bytes
SHA-256: 072425c4a2562fe6e1041b9120678537289d91bb0df7410106a4192cc5d64fd8
font_02_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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