Malicious PDF — malware analysis report

Static analysis result for SHA-256 b611da99b1d593f2…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 03:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c499614cc04b080efe023600a5154764 SHA-1: 42c95b85741a16475f310c2dfc17e86e488c7d56 SHA-256: b611da99b1d593f2c3abf9fa25d659d91448aa598ac8307970ffa29300fda765
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

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 https://millersexpress.com/userfiles/file/50734472328.pdf In PDF document text
    • http://opusincertum.it/userfiles/files/72488442802.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/43538792773.pdfIn PDF document text
    • http://kvrhousing.com/uploads/38426780239.pdfIn PDF document text
    • http://upakuika.com/img/file/78483971043.pdfIn PDF document text
    • http://domainecomps.com/documents/files/bipuk.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/vitakido.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/metuvosifunagidololekizi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kanukejomu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd6bc5dc4---bufanebaxusolajomolu.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/zigatadobozavumo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/17b4cf60eb89c33dc14d1f45686ff178/62108820497.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/nosaxidibanidonewunuzak.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/60120725710.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/korupusutatixadag.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/xuwupekuxelak.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/37058352822.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210913_947E703CCB621D1A.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/34248361240.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4abc21e5a---73238824614.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/58400214800.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/losunaxelax.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/tiseferi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uqk2ihaqrc4j7ektma8fqgdgct/43774273406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+game+driver+preferences+android+10PDF 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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 11212 bytes
SHA-256: 4dee396c199988af4ccc3abadb989f6bcc9a0d7ba3a37fc1d850996cc2160683
font_01_sfnt_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 14520 bytes
SHA-256: f96e9b3592295f0e492e32b75e1b06e737028aecd51a626e1379e18b1047c9d3
font_02_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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