Malicious PDF — malware analysis report

Static analysis result for SHA-256 199643b4df5ac362…

MALICIOUS

PDF

77.9 KB Created: 2021-06-29 00:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb3eab79e68ac8bf0e18a44ced73845d SHA-1: 1faca8470a77ee8986892a89b342edf7bc801750 SHA-256: 199643b4df5ac362392431ab5f6307df5ef82dae4a753ab9f55ee7cffc0d66a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or scam attempt, likely to trick users into downloading malware under the guise of a 'visual dictionary'. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://drafthe.ru/uplcv?utm_term=visual+dictionary+pdf+download PDF link annotation
    • http://mamam.by/upload/File/file/58248702147.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9126313287---87792344439.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4afd03a98da759c40e2b5289392ad7c5/vizawefi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/60695751244.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/mawubunezawomu.pdfIn PDF document text
    • https://bachson.net/upload/file/dozonexip.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0dfaf1e6321ba80cb543271322c7dbcc/padoj.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kivudapujibarinufid.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729315311---miline.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/97876724633.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/fiwesoj.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/4443490752.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/bawovetafowobaxobab.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/20840301558.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/bevomosatuvonubar.pdfIn PDF document text
    • https://estoniapools.com/contents//files/96654263236.pdfIn PDF document text
    • https://edbcagliari.it/file/tapexirutuvoxufewavuwelal.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/443fbc43f144ba9832bb2f11c7bae54a/jupalipomor.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16074a14319af1---17076940244.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fdb6aa8576b272d9b14fbad29a613921/51124635171.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06c93b8a8---wijuxo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b45f23895d10f0396fab020bc68f25fd/jirinojukotu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086bac7147ca---zezufofotibim.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q4ls1nj5deo78rr8tm6hou3btk/91172959786.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/kujozisokabaneguzisux.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/300027d37adf00bda7b7979ec50b0980/65988516404.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_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 16488 bytes
SHA-256: 711af31595dc73b3cca8ec6033bd52ade5806ca8b8de49d844046a520f426723
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10752 bytes
SHA-256: 597b143974e049c90a5cb31c7b6500882795fe48e28598b18d18e2e4cb19d5fb
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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