Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6009db35d4fa360…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 14:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca30d5f46ebca2b676f495f7ffb9787c SHA-1: 21b8b5e869b320727bad014947c70e2a237c4d78 SHA-256: f6009db35d4fa360c93283bb6dec969f0b4499cc71facb4485eb895af0d8ce47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. The PDF's structure and the presence of these links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://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://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_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
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 17572 bytes
SHA-256: 656fe5ff6732c53dd5d82782e16694689204029c89a3c266418e8fe02b56b0a1

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