Malicious PDF — malware analysis report

Static analysis result for SHA-256 784ee5455ea8e7a6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 03:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73da0d6c435590a6b57be3a0553b0b05 SHA-1: 183e9ba371d0af20deaa3564ab773c9e89cc676b SHA-256: 784ee5455ea8e7a68fa51708e6b0c94efe9fff86e1b1729fcde0da7d63dc2b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26f956f30---tokirot.pdf In PDF document text
    • http://fanghsin.com/uploads/files/202109121634233497.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/wuwokupizupovowupe.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/jifepibakizazeduwoliluxev.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vuzazepixivimadudomum.pdfIn PDF document text
    • https://diphong.com/uploads/21334261418.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/68570347121.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/81759059261.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/34481118037.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/78182622907.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/setamelilimogewuvel.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c61e0b8427151cc1d7fc84aaaaff1b94/70319751663.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/34918840904.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/39052042579.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/toxegibagasinu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siniwodivumegibededaw.pdfIn PDF document text
    • http://actinq.nl/upload/file/nekofokidaxofuneje.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145b7487656c---sumewozugu.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/rubigafo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/taniku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb554ba99---40641606789.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/furefokusadufelob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=use+wifi+adapter+on+androidPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 17312 bytes
SHA-256: 90d7d6c5dd4925a5d89bc8ba613947caf55e6c2abe7b35dcff0707a289c67a17
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10536 bytes
SHA-256: d1ffe7ed59510f4c1e25a9b5f08481fd3a7a358d6a21fca593a2894950101fa4
font_02_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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