Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dc194d7b5863ee…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 22:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69ca9c83123b9b25ac3a72315c5a98ce SHA-1: 17420f3c9e8763aa6e7715aca195e545ec326517 SHA-256: c2dc194d7b5863ee09be2bafc62cc88b0b98fad6bf4ceb24820b3a609047b52f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lexxyin.net/files/fckeditor/file/balolatulunetedu.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pomikixoresumakozikik.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gowoxaji.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd652da67---97616113835.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071b714244e9---53042739573.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/93982875558.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/15408566387.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/sugatodusiduru.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021081208545673499.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/41681145039.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d381f22311---xuwajunapurorewewaze.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/riniloli.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lixawasitujukig.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/41173271939.pdfIn PDF document text
    • https://hse.tw/upload/file/zavolu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adc52ccbe---zokovawawekoweguxiduvul.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/03152738497.pdfIn PDF document text
    • https://guijek.com/userfiles/file/bofewinozu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fa2466724855939e8afe6a56ae838130/76190066795.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/71389429889.pdfIn PDF document text
    • https://hsse.cl/files/30118993553.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/49955980670.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/t6pcefag6qnbs2vv9934vvffr3/mewovug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae9c029a8---4430327859.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16104221c5b8e1---gedipejubapejefurul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=present+simple+vs+present+continuous+stative+verbs+exercises+pdfPDF 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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 18060 bytes
SHA-256: 63a8d2a4980fb4b1d0daa53d95d06333eda578e05a3398fd28f478733c114726
font_02_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 11188 bytes
SHA-256: 5ba62d39546dd58223dbb54d3604e0648510de5f99caeb97ca41d386a4f57a08

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