Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c9c6630f641249…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 09:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6bc7e3139bcc175db7ed35503f3efda SHA-1: 2969943f55f52d08500cacc3056f69d81183ac03 SHA-256: 62c9c6630f6412491da45483ada1f13d0462445a8f36caf26cad03ff64422e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=mms+will+not+send PDF link annotation
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/56331611978.pdfIn PDF document text
    • http://kaies.net/upfiles/file/volewo.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/8933051710.pdfIn PDF document text
    • https://mmszke.hu/files/file/67959891116.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94395117095.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141175098b30---17705603019.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/poxuf.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/76193531978.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zumivunoxi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/83746221795.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/gufirurajologotubanisom.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47086907936.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/kibuzusomijexax.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/78a3f0ed23d19012ba1f4241dd6b00bc/posonu.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lobukatutojakibuzopubalo.pdfIn PDF document text
    • http://apismorava.eu/docs/tirifa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eace0ed4a---xunitivebabivegoniba.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jonafo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4aee3118a4ba2d08d9753f8e282bd34a/retenovig.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/suwubijeg.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fapipemizijusodafezafop.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2049a303f0cb6a4c15ba79d8ac1e1c53/zedusi.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/junejozusura.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/wimevolorolinibeb.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5f5b9a932ae1280ff5740a9910586f99/99469156084.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_off0000c553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10224 bytes
SHA-256: 2c9d6612ee76de01e0705f89ecc09c55053aea09bf2e36728cb5a63c35239f6e
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 17108 bytes
SHA-256: 4f5291899078c5b0e85486125180d011efc20dbed14a8142a94ecf6823b37c5c

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