Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1c211cda2b07a7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 10:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07e786fad800efacc553e4d28f7b0ddb SHA-1: 706b2e0981b7f59fcb7139770333b087902a130a SHA-256: 6c1c211cda2b07a744deef03ff4fb815f2d5346582fe26af11c4def1a0749709
96 Risk Score

Malware Insights

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

The file is identified as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate that the PDF acts as a link farm, pointing to external resources, some of which are hosted on potentially compromised CMS upload directories. The primary purpose appears to be redirecting users to other PDF files, likely as part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://kozhikodedeaf.org/admin/my_files/file/folosezukirevumivoku.pdf In PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/karugebabubeg.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/tewogimegidekanogu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984bf30938e---59210572672.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fe88129c---94238341399.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2e5aabc6a07d0ae757d2419e92bd5ecc/bozujilezunomotogofemeto.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d850369c0---motunuxufetedadatobewefi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db78d450f23---nowobob.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcec046d8---94435166037.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/relifakulaterawenap.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/95772775196.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989ca7382e6---91316057167.pdfIn PDF document text
    • http://livilgirls.com/files/zolefeparebugunudidi.pdfIn PDF document text
    • http://abwrva.com/uploads/files/vabodupe.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/vesowelibixi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/netuva.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/wekisovefurijage.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/9824576865.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/71386836173.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da8202604---tujefi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083621a66e11---tosugotisobewukikokaxi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///2942453141.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/vadutorelowo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611492f8a7899---16291455596.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/29182590187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ias+37+pdf+fran%C3%A7aisPDF 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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 18360 bytes
SHA-256: 0930ba64a0782e47a357206700dadf05679ff8fed2c5828504756993f9f28c8f
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10468 bytes
SHA-256: ccb5b6114978cc5c674e6e76ef27bf341b11f1242e8edbae05d272762d7a1d1b

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