Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70c8348ef6476ba…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 03:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68960eba6cee542b943db05531b3ba78 SHA-1: e73d452328c76aa81f4cf4afbbdd39711c590c53 SHA-256: d70c8348ef6476bac001a9d1604b6fd77715c0d1789758f2864df6fddc32c2c0
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

Heuristics 5

  • 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
  • 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://flavio-tonon.it/public/file/dixezumubalamotan.pdf In PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/71789457717.pdfIn PDF document text
    • https://medtek.vn/storage/file/22344313023.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n0b65gn3nb6e0ja9g0nphljof6/natuzexaguwisafejugusaku.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f0b0577dea7e3c9a0427625e34116161/bonozadotedo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102e688b4cdc---25997864071.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/92243564597.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/af708e88d6750172b077524921d70cab/42128390704.pdfIn PDF document text
    • https://dacola.com/upload/files/38365400749.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/lovaturapedosuzorixa.pdfIn PDF document text
    • https://artbynela.com/uploads/file/87529867095.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/45553037773.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508173025674353.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a966ca06---25464076964.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tupabakezoj.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/80edd5c6229f3d401e700bcbadfc3d5f/pamixotametinovagidunenap.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/33482588324.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/naxifuboxifugavapikexidu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/48qkelm55mmj74e32dhkjaej83/20341555748.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/931eb8f04e6d4a4c9db326ce9febc058/17776283221.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ba06f8e5---mexixufezibuberixor.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hunor7vu18i0ubrtadphb3aqqf/sakijorenemopipigetog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=example+of+a+frictionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 14768 bytes
SHA-256: 09207a9424cd909a5778ac0eabe93bc592055bc50ccb46927f9cdb88f704d5f9

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