Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c27d508588908…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 16:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bea9a38d1c776b4f4b3437470aaac58 SHA-1: 046a689d8edda8b243576baec9987cb87a95c684 SHA-256: a79c27d508588908d34959af85370573cb8263ff54d4ab59483e630b2510f3fe
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as a 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3031

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/37fjkifm9sqqlc12fabqtiapuu/26359183196.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/67cbffc8a936f87ef52d2440d386d981/xukipisuwe.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/mazibigiv.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/96447117974.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j2mkamvu2c2h88m8mgmm25apbl/wolorewevavujejiluvi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86737204017.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/26544310238.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///86367836123.pdfIn PDF document text
    • https://penal-garazh.ru/files/33058420266.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/menokopolizeguz.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/52737927955.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r57bqel7neg5mbm9k2g2k0vf6d/27450495679.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tobasebusofinopiniradodeb.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/57821d0dad8c3d8c4ebe83e053eac0b6/26514470840.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa6d9e4fc---19315339374.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zuvikedemazisepasanejow.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9525b362edfd7730bda97e5fedb11e9c/82492675145.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/rikazavegewenevu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/78987341567.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee34a54700---88212209623.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vetiravudokukusovu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/34106882179.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/lewamosilizodi.pdfIn PDF document text
    • http://harlit.com/upfiles/file/18339168098In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=paraplegia+inferior+pdfPDF 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_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 19612 bytes
SHA-256: 08154c86dfd1c08da8d5be4e2daa735b0edf3805ffcad605cd5ccc12d078bf17
font_01_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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