Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ed895d7b48d50f…

MALICIOUS

PDF

151.9 KB Created: 2021-06-27 05:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f72d34db8a7f679d15e3db72d51991d SHA-1: c9942f2a8e6af4ef038a1162caa133d3efb22690 SHA-256: 13ed895d7b48d50fc69c4c63141e623299f2f6535b1bb5862f9cd25330bafff7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms on compromised CMS uploads indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://medvor.ru/uplcv?utm_term=not+going+to+college+is+a+viable+option+summary
    • http://liyangah.com/Upload/file/8927737184.pdf
    • http://karimeh.com/public/userfiles/file/sejufow.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b236b44939a---85236355984.pdf
    • https://hotelindigha.com/FCKeditor/file/76796353839.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghje50rtvt9mtu9ivkdu3sl164/23369708894.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092d203bb409---31581211066.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a34daa3b---kajifoto.pdf
    • https://secolink.sk/userfiles/file/59679158095.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/98g1vgitc7t4l353arqecfk431/90723699218.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bf6ac582---fovubixexoliwodu.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9a9fbae9597df71ef73169cc838c286e/73590737173.pdf
    • http://atol-res.pl/uploads/file/xegasilagafejepamaxi.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105280142378987.pdf
    • https://autotronics.vn/userfiles/file/zagovusemesepiza.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ed91ab920fa451971766baf5beceee30/nejofuvenunu.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/baxixutemadifononovaja.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/71069352778.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdeaf5b9ce45dd22046593212d70a347/89568092021.pdf
    • http://teplospectr.ru/images/files/70068141369.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027af461b1---fefibebebuvafezer.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/729938b6cbfc331373e145727d85c147/virenudani.pdf
    • http://owv-sad.de/userfiles/files/geluruputobemu.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a16f6650d---vumewobukuvafipedowozak.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e2bt119q3721gt9hu1sbcfnhins6grfm/95561663984.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f72f6936112c43c1ba9ec27ff0001a02/25784212215.pdf
    • http://officinedesign.it/userfiles/files/35331422137.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ef6a.bin
68e10e6f2e2607dfe095c347277c06af39d76846a405da3a88255e6a755e8755
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF6A 18488 bytes
font_01_sfnt_off00021fc3.bin
d34b8658b632d354b857b36d7642c6e51dc737830a9c08700b75d8bb134891e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x21FC3 11116 bytes
font_02_sfnt_off00023987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23987 16792 bytes