Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e808f4c4afaca41…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 14:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10bd74dc272a636a72cf4d9df05f0148 SHA-1: f230171918cfe48ec4e22d079571fb8f52839bfc SHA-256: 4e808f4c4afaca4192ea96f932e0671273e7d59e85d67c5c3e6c657ed2e213c1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links strongly suggest this PDF is used to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/273f3d9cb2db924a32827d087810d93a/76156196739.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///kokusuretapat.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/xuselazedosibiwukafamowu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340b2c7c1b---zajovi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fcc5e3aff---18145631405.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/8106741943.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e18719b---sibivadusuroma.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f24fc75f4---sonisovepinuxawekidimow.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/44252494726.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/42485523159.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee5e83f23---95100111890.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d0e4ca6cba8f074766eef414fbdf151b/potorufenogasosogugagelu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b582a626689---nawewi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/98755881755.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/38387757754.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/37126454328.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/xojikagipategukix.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6snmmidurgbhevjrhgsvla9li/73960238442.pdfIn PDF document text
    • http://quinta.cl/upload/files/bigizuxoja.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tugovufimexazurobef.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6vun4o267vh1r5jfkn4un6pjo2/61999913806.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb163cc9c---taposegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=softly+and+tenderly+jesus+is+calling+mp3PDF 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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 11556 bytes
SHA-256: 3f9832d5604c4cb26c499d3263c991487cb3dbf9764e96825a8b66d0bec642ce
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 18068 bytes
SHA-256: c7581555152a1b26d486ec771ddf8f0e51b043c389e714d9f29bed3978586ee0
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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