Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbf799f38722dbc…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 21:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e47de751e4cad27dd2b1f628361bfdfd SHA-1: 4662d122085b4e919c211a4c9ea237c058518dbf SHA-256: 0fbf799f38722dbcc5315f63c734624bea1624a054faabaefd61657e0ec33944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's used to distribute phishing content or further malware. The embedded URLs and the nature of the heuristic firings strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=write+the+number+45+as+a+product+of+prime+factors PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf6499272---tonisamalavonukoxuriro.pdfIn PDF document text
    • http://etre-belle.su/images/file/segitaperul.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3073111883.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f130d9b0---kazotawa.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/97038844597.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5c4dc1b1---86113795438.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebfbe11b0d---kuxetofimotumabali.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4d613d1202d198915e015b7c0964297d/51465889114.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sefenonotasalobonax.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/firuludofunarovi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b1bdb0a3ee3932a9a3356884efcc9ab8/60990146950.pdfIn PDF document text
    • https://atrax.hr/files/xepabo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091627b4ba23---tilovuxojilulikoniwekina.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xixogorivugutowu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae6811ad8---36531510964.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/48413928405.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6220b0412---tabuninubisikerafu.pdfIn PDF document text
    • https://argumentua.com/i/file/34468458464.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/59324349702.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13391c7f7d---xitetusinojorekekofilef.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/65f10f37041a125a3030ad7de755e169/gebulilekapot.pdfIn PDF document text
    • https://zold-kommando.hu/files/jijexusozowasemelepito.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wuruberiv.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jka8bt8qh1vg5mjk6pb68gcgq7/nagowavesejix.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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 18960 bytes
SHA-256: b2981e02b39926ce73b66f72484e411f5b2f24628867bbcd21275c9ec21ef29a
font_01_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 11284 bytes
SHA-256: a3e313a4e9856efad0e4daad42bbf5a9fb4ba5c2fa5abdbf4f8638bb459f1a19
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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