Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c4a5e1f4bb043c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4f0ea2552a86a07a35145f499c4937c SHA-1: 69ec9f29ab5c03402c988eea1fe8df21ca3b476f SHA-256: 99c4a5e1f4bb043c7f0afdea206790a78e8ef9ad0ed1417fdebc697187efa60e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic findings point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd9b9f083---mavonurigo.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bdb68f1d1---pigutet.pdfIn PDF document text
    • https://eucolait.be/userfiles/files/69102728284.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dut48uhui007mknhd6nr2g3ot2/rubomoburexefotamofuvare.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/319c01d2b318e677a817e2c0bba5b9c8/72502786915.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/zatakewa.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/9226522377.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/zumotozixuredefujaxojevi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/55783653967.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lijuditawedaxalusutubokez.pdfIn PDF document text
    • http://wenxuezj.com/images/File/61997712800.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/sazidesug.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/xawuvolazajo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e95bf99cc4---5011017658.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xubawoxiridov.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bc70585bd84353328cb81c01810a9b42/81053378506.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/bb765df86c337e8880af135099900476/4954374795.pdfIn PDF document text
    • http://aplus.to/userfiles/file/piselofigosuluz.pdfIn PDF document text
    • http://rc-modeller.se/images/file///21461287939.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fisiwezurupemifimo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/gudusixevikuvezaredim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee40b32283---46811702270.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/47d89fce952a777494843b78957655b1/77352899165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=banking+service+chronicle+june+2019+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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 20664 bytes
SHA-256: 6bb9e9f91d0216bd02a420c35de37aeafe7270c30758c91f67cadcadc6e347be
font_01_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 11704 bytes
SHA-256: ad06f3e18fa5f9b0ac63b3cbc7d0ef4fa37334e10752c4a06c6539ce3301fc02
font_02_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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