Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c886d4af4d1ef4…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 220a659e2870ab65d8c06452c0faf0cb SHA-1: 4f28f3c67ca5fc3f57c9efb9ac0d8d05a54fe639 SHA-256: c9c886d4af4d1ef497f8a1f1df628edf5089aa427f76e694a99689003a385cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=ejercicios+de+matem%C3%A1ticas+para+secundaria+pdf PDF link annotation
    • http://maremio.ru/admin/ckfinder/userfiles/files/pujowitopovive.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/57391632347.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca58392dbc---56524395295.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cb89ceb9c5eb090d790f9029fb86caa8/mebeke.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/29283830785.pdfIn PDF document text
    • http://camwater.org/media/files/bexokula.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/96826212403.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/fuxokezanipafag.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/32040581009.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/72645163665.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/ponenug.pdfIn PDF document text
    • http://sivam.pl/files/file/54779758481.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/dmlgnrhraslb7hcjdldba71olj/58261976643.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sawelisonabigenilatiwusi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5efb8962---95871518891.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/weduvupozubulizak.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/71160311161.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/45925640577.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/jadogewilo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109672c704b0---97265578507.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ca188fd16be5728a3befa89a96a03241/22687619458.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/negeledevadubofigubenogug.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3f739c7f---pekejixo.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 18756 bytes
SHA-256: cf2686645cba70c51f276c3491ddcf944af47b5a1561459f16cd8ec5471d702f
font_01_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 11128 bytes
SHA-256: 20a8a685926528166738d5bd39c8beeb1568090ee4affcd5c421ba777da6a2d8
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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