Malicious PDF — malware analysis report

Static analysis result for SHA-256 402322341c872b30…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 13:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d8f057f043c8b3eb472914eb1b8ba72 SHA-1: 2dc0a07cc6b07e6d3b38f70c2c10ddc3e682abe6 SHA-256: 402322341c872b30e011811a3592487d6651285a9db92b95ed86b1ef5b5c09d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to other PDFs hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://cosmickino.ru/sadm_files/xejev.pdf In PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bepj8e989mgnplg54vnqt8snst/dudesipa.pdfIn PDF document text
    • https://onlinendttraining.net/files/96742661581.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3694d865---tazakuwena.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/juxezudanixinutobalutuvu.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jodajukoperibusumud.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/kosimejomawawuz.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/luwewefamixugoju.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/fajatawoputu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77651794575.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/42185688908.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e3e850108---54310862149.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/af1818f3959c6d1493d7cc74e84554a0/bixorowap.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd70fc2a7b---24505882315.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/rizonuxumevusixap.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gifejokudopome.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0c78596af72a655e3855ef51cb59e603/derejofegobozasanoranoze.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/54844fdd0d20561e6cbfe17311e1ac31/fuxirifutimowajapu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840917487c---82926176437.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/89996332894.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/dovoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=history+of+photography+pptPDF 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16908 bytes
SHA-256: 9aeadbb0ec5de7e8dd4012c61b5fb030dd977b16456e37701dcce03f1ee2d3ff
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 10460 bytes
SHA-256: f47794287b50196cfdcf182bcec187960d619aea7d362952b8efbe4a2084ae23
font_02_sfnt_off0001358f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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