Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be70e2b66da8202…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 17:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 657db8f972547c57c724ee0c456be43b SHA-1: 390b030460534c48a1a45ab0a473d3b33b320a4e SHA-256: 1be70e2b66da820275d5adb3eda08809cc67b30b57359cc37b1703505231f7c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tongchangkj.com/uploadfile/file///2021090305112473.pdf In PDF document text
    • http://uptindia.com/newsimages/file///80059752742.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/79224902271.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21837531244.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pisobokesetuzesiwibopukik.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/66646299434.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/92693028323.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/21930659427.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/45479168333.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zimowizilebamakegedizuku.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/66293467804.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xalimanodin.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/netupizikorik.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614175be51979---nudovejosugikef.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131938ae255d---bekegiwajeg.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210916210931.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuboforizutu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fbd57dd25---limuka.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/66016043977.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/ferukives.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/30805742026.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/vewovekisidazetutinoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+can+i+retrieve+deleted+text+messages+from+my+androidPDF 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_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 11176 bytes
SHA-256: 69aea23d4e24f0f95f4504b9f34871c0b14efd55bda04c379fcc29d112059bb9
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17484 bytes
SHA-256: 3a94903fb8a0828e05d6848600afb70811d2737d201b7d149949cbfabb2aaee6
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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