Malicious PDF — malware analysis report

Static analysis result for SHA-256 1698439bdef9854e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 16:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdf25004cab9837dadb611fe170a805b SHA-1: 02e588ef47cd27bc3829fc27fb90db6af68d23f4 SHA-256: 1698439bdef9854ec5cdc5a5f58e38704fc2427c729623be4550c8e1b86edbaa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7801

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.
  • 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
  • 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://drafthe.ru/uplcv?utm_term=google+convert+pdf+file+to+word
    • http://churchtextile.com/userfiles/file/688498186.pdf
    • http://hzzxtl.com/UploadFile/file/20210707132637059.pdf
    • http://mastrodibaglio.it/userfiles/files/mekigamefuxoloketube.pdf
    • http://grandviewgroupresort.com/upload/files/pebulopilasasigejavodeko.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/sagaloxadir.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9da400665---vifuguxir.pdf
    • https://atraba-holding.com/userfiles/file/76967857711.pdf
    • http://stevis.cz/files/file/64777413505.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608598a98e2d8---79051198877.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/lomof.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/mevelatexunijedejap.pdf
    • http://tunglamgarden.com/images/fck/file/70043227635.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/017dd171d95ab55521be0c28342a10c5/95274494605.pdf
    • http://chandigarhdatarecovery.com/files/file/9289916617.pdf
    • http://studioingtassinari.eu/userfiles/files/fezeji.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m44l7l7mdkqgvu891p29kd0p83/vafepipupefezexilude.pdf
    • http://cn-junsheng.com/upload/file///202174224417143.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/68189382002.pdf
    • https://equantumconsulting.com/files/files/5606985769.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad895c6080b---69898431754.pdf
    • https://advik.net/userfiles/file/54582230474.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3c21212272a1dc3dc725b09c82b83500/74330826891.pdf
    • http://dallapietamarchisio.it/userfiles/files/mowepadoti.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1302fe564430a0ec36054790f8be036d/55667193811.pdf
    • http://ivankotov.ru/img/lib/file/27278834563.pdf
    • 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_off0000e722.bin
95cc1102874139e1a292e4f569e0ff2cbca888094e6de98e33abbcc1d0e878c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10656 bytes
font_01_sfnt_off0000ff80.bin
e8cfbab61563b3298e1361890f2303001d025d78941149d2d22cb67252d2758c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 17804 bytes
font_02_sfnt_off00012e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes

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