Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0ec5406f68fe1…

MALICIOUS

PDF

81.5 KB Created: 2021-08-25 16:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 908470e8772d9668252365ca05be1d1c SHA-1: e0b3bec39043026e97d08f5287f32aa852677089 SHA-256: 84d0ec5406f68fe1507681bf08f25ac25c63bfe4be9c0f2333d1887fa289c944
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ffeb25be15630ffffb699122829bd70a/sarewomuferorewenufene.pdf In PDF document text
    • https://photojet.net/userfiles/file/resigulamigogixumokuxero.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kizupefaguzejarizunigo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/98936962866.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/durewibetugiduduv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23269a141f---rutiwav.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/vowexikekogovixiki.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a4fbb5dd---82978612954.pdfIn PDF document text
    • https://tepihtrava.rs//files/xuxerurigag.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b370382e---37069776757.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/du2kd5qv7l0u509v3uofjct18r/zedixarabumilorawiba.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af0ae9c5---kiduw.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b2913c094---40917989395.pdfIn PDF document text
    • http://yumasri.com/assets/ckfinder/userfiles/files/84675709948.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/70796578531.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/novaxetoduxek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e9b9da106---66420161543.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/51850484153.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16113e03b6f7bb---porabawawaborepofixiviw.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lokowadolejuxolojejodiwa.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/71778514048.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/48474609659.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c1a6369ef---sufigi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abea272c1d8---telegizobumixomad.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/74857178190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=prefix+meaning+in+englishPDF 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16416 bytes
SHA-256: cdd05726e4a92aa746a5b84f9cf8d6534eb4c71ce97f289e978fec60359d1326
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10544 bytes
SHA-256: 0f49cd8840045ece6e596181cc1f67873e32d51fa752e994a1612ccbe0e3baf5