Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5787435c8a90a9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 07:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8f242fcece2c2d83595456b7043c167 SHA-1: bbad37d8892b1aed2bd1ccdc89f017647687c483 SHA-256: dc5787435c8a90a9a9e8378066c26d57ca5f3d8948b27d5a2c172a8eb33e9664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable hosting and compromised CMS upload storage, indicative of a link farm used to obscure malicious destinations. Heuristics and ML classifiers strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shipagents.nl/uploadfiles/file/41078177579.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210919_573584213336BA96.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/75393323705.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/27568160415.pdfIn PDF document text
    • https://tcremich.lu/files/files/fumutedopipofepevabeve.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/fobodod.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/17041381200.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/33288403733.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/miraxewuboroxo.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109032228572412.pdfIn PDF document text
    • http://telektrans.hu/editor_up/bilenik.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/77442789051.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091614102673499.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/55344873324.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/13704067167.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/73158413582.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dujofovaraxigigenubutas.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a350650---24575639146.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce1862480---17676107133.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/73428342418.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d30e21471df8608c487a73fd8bd5f77d/25896308970.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vupusepofe.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fruits+basket+2019+wikiPDF link annotation
    • http://abcs.umontreal.ca/upload/files/40474345061.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 18732 bytes
SHA-256: 8e1561b24707fc2eefaed6cef6c35165b35e967645e90a2bba2ae98b2ecab8da
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 10688 bytes
SHA-256: 4bda9227d320c2739724c5f6c7e85f0d782ce1a882bd14a396d6d90399f4df57
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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