Malicious PDF — malware analysis report

Static analysis result for SHA-256 722dd3078d5e32c8…

MALICIOUS

PDF

74.3 KB Created: 2021-08-11 09:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a08475ddd1c6606660b69049b1218bf SHA-1: c81adb434c7d52601f68f30f803f9ab4ecbdef94 SHA-256: 722dd3078d5e32c8065ae24b9277ccf1d434735be30ec2967f17c355b8fdc8ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=prentice+hall+literature+the+british+tradition+common+core+edition PDF link annotation
    • http://www.jokilaaksonratsastajat.fi/file/1943228384.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/70041096790.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b39d2fb6---zeduramikodom.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95baf5f07e---diwit.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/70005867802.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bbbf7037ed2f9d2635dccae4fcf0ab91/sivisimuref.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8067d610---45349147236.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296eb3e48e---58044119839.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lixelusijexu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/sowez.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919b0737a07---40622012273.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1d40eb7157a8eb12b789f6d0a33a7765/xinupuwedinenepifoke.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/59bb6e1193b04ff1352885591e21ab1a/vopibenerisadese.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/puvopaponenole.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/waxerokuviju.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bad0855ff4ef16caa0ce5fd05e92e13e/30938750427.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae7261a8c---visapugitixexobubupoxatov.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/femofubemubonod.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/xalesomeni.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f732c358121---56543807015.pdfIn PDF document text
    • http://attlas.center/userfiles/file/lazowagelifa.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/fovewebefomuj.pdfIn PDF document text
    • 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_off0000bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10876 bytes
SHA-256: b4199fcf30cf56aa38aca9e55dc0aaed0b2d51b4c010c9b7bcc7852e4ffe569d
font_02_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16276 bytes
SHA-256: 59c6bc035a2615e384cb8e15ea9054edf24058a7e28c86c42ffc894fb6e2a873

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