Malicious PDF — malware analysis report

Static analysis result for SHA-256 e758e0e65d42ec2d…

MALICIOUS

PDF

103.1 KB Created: 2021-09-22 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 815a20614995b56f312563b7caaa7a63 SHA-1: 46afe131e10ae548b2b3a933b29257c0953fed52 SHA-256: e758e0e65d42ec2d888055bb78643a13c439dcec29f60fd0316e1140e48ad15b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=stream+boruto+naruto+next+generations PDF link annotation
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44099738011.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/14082819699.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904201153202608.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/62274101634.pdfIn PDF document text
    • https://jobtiara.com/files/files/93736348165.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/67455712853.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/rodugulimobemageju.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161497a9359928---83536599361.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/vokodegusa.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/nemoxakufezupuwejizilo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h1ut91vasf7d7bvfd7fvd4t2vi/surawimimuxixiba.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/zigejutetetunazidisuge.pdfIn PDF document text
    • http://asid.rw/userfiles/file/59316580725.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/gupuderezogegazitejone.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/52581592150.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/mibomimize.pdfIn PDF document text
    • http://ametansk.ru/uploads2/49535796893.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/54f4b2618mbca9475ffo2n1mqm/xepuwexet.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/50062609396.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/1589872992.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a330b92531ee58a32ca29ce5d2208722/mefomadiziverefatik.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/kodajemiwojutudop.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/16320872897.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/nunarexowakotana.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kevivegukonetepekeduroz.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_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14299 10824 bytes
SHA-256: 907975365ee2a2d60b3ea81c162f972abf5111c773119ee98fa9f06f064c63f6
font_02_sfnt_off00015b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B90 19580 bytes
SHA-256: 75e354821b665766fd64f09d8b8e9ff14f1908300a0686c4525ee1f7899672ee

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