Malicious PDF — malware analysis report

Static analysis result for SHA-256 31072e578e1cc126…

MALICIOUS

PDF

81.9 KB Created: 2021-09-28 17:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e25ff0f89dc3b38f8f10a7668f14935 SHA-1: b4f896d0daf4d1133228d15e7cbb2ba401354e54 SHA-256: 31072e578e1cc1267fed03a66312ab00de885293ef0a9f42d12e972528bcb068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=bts+life+goes+on+ringtone+marimba PDF link annotation
    • http://carszana.com/image/upload/File/32520010187.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/67551802233.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vizifukaf.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/jagurisizixifuloduvur.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/4751110909.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/94160440717.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914103758.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xozagasemofudubuvixurujod.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/xuwofopobivexivi.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://alwaysshine.com/fileimage/file/502492639.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/46046868622.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/gegupi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jufuwiz.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/69946427608.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444dc9b7e21---nomodebomeligafuxitimat.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/38231949404.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/mepimof.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/61321163044.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff64eb96d---30101822619.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lizapoj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269b62b074.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 21160 bytes
SHA-256: 7bd7fb44cf3517fb6c542b6112e5b82910d6cc1fea470206d46b512fd945ef9e
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 1780 bytes
SHA-256: a57b5e548eb6e196a4c2fb4f57891ffa18af1e14c0832b5aa59e081340eea67c
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10752 bytes
SHA-256: 82f01cc171e571d7fe2c7998c96b7887a12157551d2cb1e82aebc0d2ff074319
font_03_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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