Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f734561cc376b…

MALICIOUS

PDF

83.6 KB Created: 2021-08-01 11:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3c31658c1fb8221f008045f61c2f2c6 SHA-1: 182fcdef43428f17ed53f3d86528c7445bb23fcf SHA-256: f61f734561cc376b0c2379153c62ea71be0fe6491d85216e8b75b5b8745c4d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://accessprecision.com/userfiles/file/63805523340.pdf In PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/e70635f5b02f0f3ff3230d39683e3a6a/xekugixidagojog.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32301725d---nakurotuvitu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a01ae06c994cfa039409549f2e5648db/gopikad.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb6444fe70---12861476934.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b242b1a41f3---zaviriwovokotubanur.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/pikexubixazaxemokaxum.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wezezijosogasibusonimo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bb8ad3e06---23386068089.pdfIn PDF document text
    • http://synergyproperty.com/images/files/fuzomuve.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/k98ll4rq40gf48megr5rfip962/66872695238.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qtfbod0it2k8r8hp64dam5u8a2/pobidenuvupowotumedexiwug.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c8h6fs8m33qlpesj2v915npr7/fulurigalonutivafurerero.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/zutefupofolowoxosu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9043e69f0c---32325423167.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/998b2264c54ad26b6a1bb3636fb13626/dewiputus.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/puzigi.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/63692690965.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mukesepomuzopizosilodafov.pdfIn PDF document text
    • http://alltechsro.cz/files/59763278771.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/bamaxakekugafiwusakewij.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ac37e6b49ebe0b0fa9c797b7669b9b94/24472666347.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2616855c70---rubogazapoz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcfa64cdf6---zodonalutulosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=to+kill+a+mockingbird+student+workbook+answersPDF 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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 17728 bytes
SHA-256: b8f7367f98024e6f60f978e9215ddea5f196d186a7bb2278c41ccd94e1bc0197
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 11096 bytes
SHA-256: f7b37680e8d26b1a7da14eef55be5ca01a3cfe0fda880c6b57b86468c31d998e
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1