Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc43ae4cd91137d…

MALICIOUS

PDF

98.4 KB Created: 2021-07-02 06:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 920c267b42042551fb6b5ff459b77296 SHA-1: e8c6cfc8dd06d965eb1225ec6bc56690dd513e06 SHA-256: 3bc43ae4cd91137dc845f66da811eec7285550b69dc572b349fa5f914623c0ab
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting it's designed to distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely uses a pretext, such as a fake billing or support issue, to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b63e08e0459---tusijemati.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4088618e---90145155547.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecd079e9b---19828657766.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174543f481---tesutuwek.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/rodurifijinepev.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/moxududimexotikiva.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lunerudepalexex.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/suxoloni.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/37973592009.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/wagalolijalibifov.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a534ab34993---82937586319.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/eq0qpk20b01cphptdgvutfmvv5/9104390577.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8c0e48ee---65531595721.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b81a451f7e786ee074b189bcd0c558f/luxinujijebadosus.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ddfc0f6004ac95ea9a0e78081993ce5f/xuvidukinof.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xegiveganato.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2893bf1a---15340987545.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/zokazup.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/16805738717.pdfIn PDF document text
    • http://langmypham.com/luutru/files/10116227056.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jifivedomuliwelixazawug.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d27c996070d---52437011926.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050321363372.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pabosizejivowejovur.pdfIn PDF document text
    • https://tempegaring.com/contents//files/58496099610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=marketing+management+mcq+questions+and+answers+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_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 11332 bytes
SHA-256: a1b40998203d9f422ee7804e8d63b1331016513a6de2a558364c7451974b4bda
font_01_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 17432 bytes
SHA-256: 32408c7f18481accc9db85178c0e9d6b1a0cfdae7ddf9a46528435d0c3491db3
font_02_sfnt_off000163fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1