Malicious PDF — malware analysis report

Static analysis result for SHA-256 034ddc3b91017acc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 16:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f2dc2dcd7ed121ccd6b8431098ca335 SHA-1: 3b0de72ec5bdcdaa0bf6a4d88148b5187fdef2cd SHA-256: 034ddc3b91017acc7b34e18798b66fcdf7a96d417008e5aeeabc0ebcc178d611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Embedded JavaScript was also detected, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=2014+mustang+auto+to+manual+swap PDF link annotation
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/69942287165.pdfIn PDF document text
    • https://mihalex.by/files/files/fetitejenan.pdfIn PDF document text
    • http://weingut-suppan.at/files/18901485679.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/buxamifad.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kaniref.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/bokit.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/texebijot.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f17aa80d---rozizakarinanakudom.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/48863815697.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf07ad83e2---mijokun.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lijexefabolisiwuwifejiw.pdfIn PDF document text
    • http://exosushi.com/uploads/files/padufijijemigonesugefaj.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67fa10726---24215071723.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/38335423515.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c2b3c3d30---23546953803.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a970e3dba86---46053250293.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98583aeb0---46377755616.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/60023891356.pdfIn PDF document text
    • https://mashura.co/userfiles/files/9552457288.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/67952856646.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89e666c1040b203d0304b408f33a70b6/pidulijozedogon.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/fopijuxuful.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sesugoj.pdfIn PDF document text
    • 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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 18300 bytes
SHA-256: c9a2cc27f1b364d6a87dcf08767b85f9f52c9a4b31455393b3a7adfe25faed51
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 10732 bytes
SHA-256: 61da3f2f2ff619d187203be43ca466f0150bdb270a9834550f2ac662762e11b0
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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