Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d9cc6f16ff36e4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b3fbcd81e093c9d99947e546e6c19f5 SHA-1: 20468e8890164eff49fc246aaaa1316a30ea7c97 SHA-256: c3d9cc6f16ff36e46184a45c4efa7bb32c503a05084df0f4bfcaa852a0610d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://huntic.ru/uplcv?utm_term=starbucks+prices+menu+pdf PDF link annotation
    • https://guijek.com/userfiles/file/puvufar.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/95l10md6a0rnt40uta7sstf4nu/puxuzitapoji.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/55990396860.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/19114316131.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d3ae8640---xamifeguzanabuwiregaz.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lomidedokatutefedazadel.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/26912579891.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a5558a85---38177150846.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930a99a8e68---vogolotusim.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf84646892---gazodupopusufipubuven.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/dobalexikomobi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507045328849075.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610757afd1ae3---96352373065.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/67293850827.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wugetegibatuwexisijex.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdfIn PDF document text
    • http://onlinevay.com/upload/files/30560776522.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/vekoripi.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/dirarasuxom.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e694fdc3---21784940769.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/dulufoxapuvipakasa.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kosobusetopubag.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 19088 bytes
SHA-256: 0a320cc624d8257bc374f69c350d4dc093f3909a522695465a8f75ed16e23376
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 11024 bytes
SHA-256: 2feaa09a3525fd22e33a8f7cd9c5f5ec2ceff4784b6e979287d408ef4a1da8a7
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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