Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d807de6a5fae0af…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 02:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71106122f774c76e31fd1c935c10cc13 SHA-1: 86aaf9a266165665b826534aca5c7d8455bdcde4 SHA-256: 6d807de6a5fae0af05c90a1384e4501591581d6789db91cc6d70f4b4ac7d436d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f8eca435a---63019979588.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1d78993435ba742bc4ce8460a194932/pekivabexazibisebufoset.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b1bb1513dd837a68953afcae50556ddb/govazitibamawogoxeraluv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610093a9b6159---90186159401.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/fulanimakiludet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca86f7b3f7---nelovemapekim.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/21667646676.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/20425213856.pdfIn PDF document text
    • http://otczenacts.com/media/files/5307096512.pdfIn PDF document text
    • http://emeat.ru/var/files/76514837320.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h7v2fgl71oeprf22g3ve6qusm2/99408659531.pdfIn PDF document text
    • http://alvitraders.com/files/neferebivunelibox.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/85dd807ab0c7cb4c69dde72352f4abb6/57368996448.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/df823b3563aeea9a1ac33e3373624c9a/ripebedo.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/romezirilemu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vapapotapofewerijezuboto.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/firolukupixumafasabo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zufolewozagipuxawazanev.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/92864030674.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/64940840691.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/22342848213.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/50098099062.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e1a28c32---xuzizira.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/36752341387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aprendizajes+clave+educacion+secundaria+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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10852 bytes
SHA-256: 6ba0087ef9cd23f78a38a55daa295cba3afe56302310f3a42a5fdd6024c5f126
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 18568 bytes
SHA-256: 19567a9cdea2ff1349ca731996de83c1d2fea7f1541178673dc80d1601dc28c5
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1