Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd71eb1eb3d976…

MALICIOUS

PDF

103.5 KB Created: 2021-09-06 04:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bd1fd521e7535f9c1198bc83e5701f1 SHA-1: 6e0d9787573dbc553c89dc4c6b3322551ac83f80 SHA-256: b5fd71eb1eb3d976c4dbec95dd25fc8dec4bb8b6ea7dc277891177ec19f9f8f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting an intent to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=telling+time+to+5+minute+worksheets PDF link annotation
    • http://mulherinscampground.com/clients/879992/File/vomokojerebetu.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/tivabuxuvosavezilabew.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/56448973326.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/45308073875.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/52402988260.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/67846757011.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/39a0e544a1ea1a740a2ba550ece239d7/mobafuritulapuzavab.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210621204632.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ae98a41d---patevesakuvowokivevazim.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/65384713783.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f917a76dd---finajatemepalok.pdfIn PDF document text
    • https://tckontrola.hr/files/26352604169.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nh2i1v9hsh1ip4100qd31f2ur1/5046065880.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/71505462601.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7ae29bb6152f9ca4b0054fd3a8e7bd3/2909342548.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/euf1ags6u8c1tpsrp9gp19qb3i/rodulasujukukupufuxovusim.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/57323054726.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jl3fuivtsddl7kd7ts28dr87i6/81972463564.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/bavupumoxad.pdfIn PDF document text
    • http://chineseclothingonline.net/File/worimatetojodalaxi.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/zureluxanitasem.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gugawolibebojese.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rorsjs90avdtm7qnri04p193sm/vonebabux.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/23679884196.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_off00012f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 18168 bytes
SHA-256: b278672b3fbc43e3776d933f31299b927a9cc14fee0d2ab9c5ce055cd90ae636
font_02_sfnt_off00017749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17749 10768 bytes
SHA-256: 85f216333b3053033d5d4234c476147473cf9a3c70d5815b90f103b2e9d6af08

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