Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7bfb9b3e3dcb0…

MALICIOUS

PDF

121.1 KB Created: 2021-07-18 08:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bac4727483d76fc9b5e0d3a76f4893b SHA-1: 4ce1baa8d6e1858433655d16a207b2fa46f2821b SHA-256: 77c7bfb9b3e3dcb0f3e38ec4deb1f739a4cf511c5f41fd4d0e26ebf2dd4299a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, and utilizes UTM parameters, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f8488e5b652827bcc34a83c6519046a2/nulowawojitovolifufuto.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a767cae4a---zikuzotorasoz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562c46c2c1---43842687437.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wulegijirumul.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/famarunesof.pdfIn PDF document text
    • http://usmleworkout.com/files/file/60907777371.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090078b3161e---regojolijokinari.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jigud.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd04be065---17513516625.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/eae8a5042d7f1f0920b659c80adc0a2c/8372653438.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/72092664945.pdfIn PDF document text
    • http://mp-journal.com/media/file/9769102649.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/41591940014.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/efj1h2pe2f60evffhjvgh4nc05/panugero.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/mehl8hmpmtg6r8mhju9car6rvb/guxapipigezezok.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/13514078660.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f94c5234---memuvabevabadefufiwufa.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/tuliwov.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecf9c5dbf---44560461085.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf24e7c2a7---11304451058.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/36177856292.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/42125069799.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9fd90781---poxunanutofurejop.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/23frn5apt79irrl0l8s4jg5jgc/65666414332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=desertification+is+primarily+caused+by+thePDF 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_off00017a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A36 11240 bytes
SHA-256: 61dbc8821f0ab0b2db8742c4081da3083cc2b8c1e269f300a23b86d1f6e01722
font_01_sfnt_off00019427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19427 16488 bytes
SHA-256: c29e328b0b8fd0772bcd2cda0283a84482d25ace625763aae4b6538bf12f0007
font_02_sfnt_off0001bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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