Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03fbc6a200e9b4c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 10:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 292b9bba5b260ade37798d11420bc076 SHA-1: 836a291dcd53f51e38f6e98c925b2850e92b8dff SHA-256: d03fbc6a200e9b4cff03ae01ebf6e72c372347ee346a86040a4208f4dbdac4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URL `https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=office+355+login` indicates a lure related to "office 355 login", likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/12ea67e6cba28b8fa1dc73840d87a1fe/wijegiluvonodenujajuz.pdf In PDF document text
    • https://texasbordervolunteers.org/userfiles/file/79976905926.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/bifusavixuvudogereroranat.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/vikixilivok.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/romuzakazutada.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/gixetiwimabajanere.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/96111814905.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7fd572a3---47982407501.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/92071155751.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/67191755083.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r1mcduoqegi353udh13pqkib9b/61000872787.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/momesaxagapuwepelip.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/57062140585.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/39409546489.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/kuxojikeruruvemuzejavoz.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/piriwud.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/85622916957.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/33592164281.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/zasova.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/mudepujoxakerajorotepapo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kamofu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9b5d7fc8---xebopudewonajamazaso.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/robasakosarunofomexu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7287_20210916125724.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35927532993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=office+355+loginPDF 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_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 10312 bytes
SHA-256: 8124c1d6dbead9395449af981297fcc4e9e28031ecefd8fc5005d04bd1ced46a
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 18816 bytes
SHA-256: 3d2e3064db3d5457d0b37c7f0e024db25d555a12bfebba05471c216e44c417a4
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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