Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86449f99607e5ca…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 20:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70ea725d0c7480be61f1ed219254d4a9 SHA-1: 1fe89c9acfaa34451b4e566683d22d72989f758c SHA-256: b86449f99607e5ca6c4b415fe9578ed64d909da90862a15b07e736b4a89852e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://pphu-joanna.pl/fckpliki/file/22875357461.pdf In PDF document text
    • https://susta.vn/userfiles/file/14911736300.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/97305514870.pdfIn PDF document text
    • http://afro-safari.com/upload/files/lewijo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160823035a5b8a---70076162284.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vesodoxinuboz.pdfIn PDF document text
    • http://suaups.net/userfiles/file/25867549342.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/29312309049.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67803860e---kunelo.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/99166128733.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/pomuliguz.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/wonexetufazi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/19533635235.pdfIn PDF document text
    • http://fructusartis.com/i/File/zogevitadaragozema.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895652f4a7---1404420298.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf0952fc6---timuwutona.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd69227e5---50032513788.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/gagexufusa.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/57443194993.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bb32c61a---metadosiwepesekekozi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/pedidukenudizota.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eb17906d---28860460987.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/sawujepumoxut.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611256edce192---wororukolut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reading+comprehension+for+ielts+academic+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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 17636 bytes
SHA-256: 06201dba6c9e74fa454094fd2fd869737ded98294178a3d4f9d6ac205bc13da1
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 11112 bytes
SHA-256: 4163cd9195f44fe3f899534ce8d0dd9b40cbab99420b8f0a40e7b6eb69e15708

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