Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b452cc984113c40…

MALICIOUS

PDF

83.8 KB Created: 2021-10-05 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a31a6911594e9e0e2b3b350fac7eaac3 SHA-1: 1f139acf6043b0aa1c7415225e66077fb1ca2a70 SHA-256: 0b452cc984113c4028cbb0a265009d8f3d794f1d84fd49713484c9f3ff377169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting, suggesting an attempt to distribute malicious files. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://radekslodkiewicz.pl/files/file/zulavemuzaridov.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e7s6ds1dsp8518tvtq03n0v187/46029203998.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dofinituxuzegulisopim.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/bulopimaverarum.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/vixabekigixowusolabesi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161407adc8fa44---vunedeziforikimaf.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/xamezes.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489ae51b21c---pesuxetoregike.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/483101928961631712135.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/xilaragiz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/62820222637.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359b138093e---56584145782.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/19757741755.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/mudefemaroxatoginebitof.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/dukulijuvuj.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/7896819050.pdfIn PDF document text
    • http://ccsl.asia/files/misubamok.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/vawaw.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/17663542383.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/lozoxebibabepo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/veranulugemapuxadege.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907091549.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6718d981c---kotirutobelegepopim.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21105775772.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/filunu.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/nugejodikazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=neet+previous+year+question+paper+downloadPDF 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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 19312 bytes
SHA-256: 74ddae81319a6cfb0e44c582eded3b6207d4a9a07ef927c6a31c5b2c165cc308
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10872 bytes
SHA-256: 972e5f434be283e347ccd0cbf17f45a45ba95dc1d0205f2ccbccd774ea8ca756

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