Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bfb241f03f51ea…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 16:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 474509ed94a397b5de092ff501011cf5 SHA-1: f2d5941aa3c372c1afb8cf03d4bf405bafc9125d SHA-256: f0bfb241f03f51eaac741db6f16bbf1b847dbe72fff19f2bd864f4cee388a396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=assistant+auto+clicker PDF link annotation
    • http://watthaistuttgart.de/userfiles/file/36294792260.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1053b105d29d1e9ff5b84712ebef474d/2254217264.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/zipofuripagivufuridoz.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/gobilep.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090920502883.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/mokajivebazevuretogu.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/30756320236.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161415b48689a6---jujiwapafexelesevatur.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/rivog.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/10054577039.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fc3192bf---80951381470.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/58440692173.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389e725672d---tegeni.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/73294005865.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/madubota.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80546919100.pdfIn PDF document text
    • http://c-amc.com/upload/files/vojusogul.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f24b4952---81342761359.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jufesoreti.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001dc01637---84268842231.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/dotepalawexafiwobidosal.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87b2a6c77---xizigibixuso.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/dukamodukes.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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 20132 bytes
SHA-256: a205cc4e696f08060c8dfe9b3bf531d19a83d92c98c69319d643746812a8503e
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 10396 bytes
SHA-256: fcd5710ae21e4d53d4af42b819b539a2ea238a16f673200c85e9ced9e5f9e2d8

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