Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c11987d51085253…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 00:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ed5188207a168283ee27563e1aaa98e SHA-1: 45dfc6d4fbc36cb75319fb697fc2f31ec65c54ae SHA-256: 4c11987d510852532d59eca2c4dd74640218a2075b2a9a3c253b6890c638a9f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to host malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=free+download+hack+app+data PDF link annotation
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5712267141.pdfIn PDF document text
    • https://andana.us/files/files/texukijazazeved.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/lokilap.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/nuvusozigamixitotafat.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908103424_1848666918.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/52193734380.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/52052749213.pdfIn PDF document text
    • https://designclarf.it/file/58652814024.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/96437368936.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/48588249534.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/papaxujisadovem.pdfIn PDF document text
    • https://italvaping.com/file/febefenuremog.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/miben.pdfIn PDF document text
    • http://giga.sk/storage/file/nivuf.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a27def2f9165719e4671fb552a55955c/jetuvijuxukajubevuxijoz.pdfIn PDF document text
    • http://travellerisland.com/files/45284724893.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/tasivujaxag.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/17825226605.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4be165d9---29982255416.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/50551359160.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/65143065225.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/50607024825.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a81d79f5a---32208073491.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nirimul.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/tewubipuzagenoji.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/wovutakogufulabalos.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_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 10508 bytes
SHA-256: 015da210d8a7426e76656c252f69a000f57dd5ee169d6cdecb54ea68a3a61ca4
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 21040 bytes
SHA-256: 63ce6fd62bf6b94f57f0238c7ee445698f65a55aa45e1d903a88b56e599db56d

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