Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41b0e25464b0902…

MALICIOUS

PDF

92.0 KB Created: 2021-08-24 02:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cfbec67c602652885ca480f66993458 SHA-1: 792ba79723e43dc93dd9e606bc0fdd21c422710f SHA-256: d41b0e25464b0902e381b9fd928be2723b1edf838cf54886369ce0a5c55abcf3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised or disposable domains. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cukiernia.eu/upload/files/63379262836.pdf In PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/97089578158.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/84437608385.pdfIn PDF document text
    • https://castel.ro/userfiles/file/pufozu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4jdn7ttdn6qce7215f68jk8mm4/xezenepufupezuvajuz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf90d6ac7b---rewiwoputunupurebekaf.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/6100705460.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087f327687fb---wurajavedofolemes.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/lizizolixedufu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1eabbcf4cd292018acd9c9d9638bb3ad/91933079864.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/43296492523.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/66670049768.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/44863733313.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/dufesikelebad.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510092918249908.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/zopefuweto.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/rivibigisemasapopa.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16109e50ea2c9c---fujamalupiresadeduk.pdfIn PDF document text
    • http://119pump.net/d/files/sutimutobim.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/puzawekusovamaroriku.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/77157278142.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gulukiw.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xakijiwiz.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/wolalurasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=southern+wind+yachtsPDF 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_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 17360 bytes
SHA-256: 4bdd0de1b15e8d33f060dc5b9169a952ccee5009d001e0de22f2021b81f58fba
font_01_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 10796 bytes
SHA-256: 9f2b7b8390f7d3fa2ded983e1198ef0fa7ee294729786c60b072aadae41e5bb9
font_02_sfnt_off000148c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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