Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b4324637575557…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 14:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee69d450a443f5c83daeb56ddfb655d8 SHA-1: 84fd95a61eb16c4b642f748356cf02b3cad50097 SHA-256: 76b4324637575557323a6c478d15ef07974989d9ef1c518e843d168c504508c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting a link farm or redirection mechanism. The heuristic firings indicate that these links are often hosted on compromised CMS upload storage or disposable hosting, and some use UTM parameters, which are common in phishing or SEO spam campaigns. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=animal+farm+chapter+6+pdf PDF link annotation
    • http://www.mustwalge.ee/data/content/files/19702884513.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/85891907144.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bd7f1f25---rejisudanabupokibe.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/punalexovojiwimowareraro.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/xivifudidobobanawufafedud.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/3003324213.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/buxarulikobejuborof.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/64405868975.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/86937986451.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/dopoparidosekujudam.pdfIn PDF document text
    • http://vhktn.at/images/content/files/48900391387.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/75692685690.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ad02d8f9---lufepaziwumudus.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/wazikumojukudem.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/3799762025.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xuvokig.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/23025893382.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vemekaduletituvunozite.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/lozoraritigewenejakajebu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be24a9f21---29512497863.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/temumidorilozokira.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/mapevoruwani.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/46957801715.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/81839305260.pdfIn PDF document text
    • https://pecintajp.com/contents/files/18692408949.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10744 bytes
SHA-256: c8b0d634ca109aa76f7276cdb4ff6107d7b6dc044a2142022664df8269ca948f
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1