Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1181dfcb30b3ba…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 05:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d462d705804a67851ac3823440ea9843 SHA-1: 0b169aefc7f34d15943e0a841d8eec60ad92d72a SHA-256: 4f1181dfcb30b3ba54822bc921b9966c3c741634bcaa79c556ff1d92e45bc28e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. A critical heuristic indicates a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste commands into a shell. This behavior, combined with the numerous external links, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://catamma.ru/uplcv?utm_term=android+studio+for+dummies+pdf PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ru6sfer809krks834mtnenu8cr/koxitewuza.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba196ea1e62---36229872917.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/l27b4a3a5gpmmn6vdgbg3tu4vf/butofatazewisajodenivevu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/wunul.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b80eb9ab---48598228081.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1445840f66---wazepozidafefebiza.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077334f13fa7---luwifozarezutupanux.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nasodoxedewimibeti.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64ad0ab64---fisazojerajexitomete.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/29780192363.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/42236217242.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/268509973.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a8f35bc2---xuxuzitexotimedas.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826516823ba---39907731840.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/nhjvjv482ubjjc2h2iob0frcjg/15375671203.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4efbaa6691349d8800ddc2c808e51c65/62059015012.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/voxusedu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd705abae---66128570356.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/87754478387.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/79486148958.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/54154843110.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7200b0a6---koxujavaposivixewodemakud.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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10532 bytes
SHA-256: ae78f54be79c3f92ef770e45a0f66983e8248f53aa4d95a94f7293b128e21d64
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 17360 bytes
SHA-256: 5af8fb57c00826146576b21057872fea217968519de37a68ed3bc1c094b23d36
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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