Malicious PDF — malware analysis report

Static analysis result for SHA-256 8754dc90ef2b9642…

MALICIOUS

PDF

131.9 KB Created: 2021-09-02 23:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa80aaa1e9e48d91fd0ee01a8f94fd9f SHA-1: afe5bce8eb32d0e49d3a6ab6ef3231a3b8f4c922 SHA-256: 8754dc90ef2b96425937291e0ccc543a1c7cd032ef5bcf451ae418d319d5a9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or perform SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://dongzzang.com/userfiles/file///vukuzoronenafomebi.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dd96c8d0---dijeluzix.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69c30c2ab---28687705200.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/felulim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d495a9bce---folinax.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/78017701765.pdfIn PDF document text
    • https://wita.lt/images/files/xolorobidugexirelukemetam.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/13184170989.pdfIn PDF document text
    • http://groupkaishan.com/d/files/vibumaget.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/buzuva.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ae5c471b---vataxojogilopodofijagad.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/nugapagafasupirixemox.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/54208996068.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/jc9e8btcr5b2taejrc8ccmtmpi/85226261205.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebd9ce507---58780100380.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/tixuwasorij.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebdb53688---pomoxovarigixinixomif.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zeniwak.pdfIn PDF document text
    • http://renovator.cz/files/file/34832730019.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/37357404529.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62e5b749b---93932337135.pdfIn PDF document text
    • https://maturana.cl/upload/file/24505172130.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/mapetegejufemosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=romantic+age+of+english+literature+pdfPDF 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_off00019acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACD 20376 bytes
SHA-256: bb0e58bb0f57c543e5dc3c808d4e70eff00a695fada2c133344791c4d681a011
font_01_sfnt_off0001cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7CD 11212 bytes
SHA-256: 5b364db9b641575716e46682276cf56c1f1c5ecbe5b3051eaaa3d60b8139943d

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