Malicious PDF — malware analysis report

Static analysis result for SHA-256 0789e32c871e9208…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 19:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d36d65db4cee58f6d2b961180eb20063 SHA-1: 42c31d77caa3ac625882ac61a7560efdcae130ac SHA-256: 0789e32c871e9208e52bc488e8770db15b5843c4f6b9c201a1adcb7d6893f35d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/baxofaluxirerinan.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2a229e11b---xaniz.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/konikimomawaw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6bb1889adad19de8bf489db6d164f56f/68320608765.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/tidazazutorimixesis.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/20486407812.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/vixigalerubixuxi.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/37815521471.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/18667025424.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/gagixivoxelexusepenuvagib.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/66058475991.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/40112623378.pdfIn PDF document text
    • https://laser123.com/geektic/files/selenavepototiji.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/susesafomufilijopudafumu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210515035954113.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c028c0a5192---guluwawudepesowibe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5cdf5a895---82270911367.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qis784bmhdb9ff0f9kqgsdjte1/73040478620.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/jegisavoto.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f6204f51b6cd4caa11702be617c1bf6a/fosapaviwufofarumomibi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/genudalobaxodixu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/tifaxeverivisefe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u0g2cejmnq30v8uhldbtcu54i2/38989433776.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/jidafowaxav.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b756cd3075d---58244060522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=frans%C4%B1zca+t%C3%BCrk%C3%A7e+s%C3%B6zl%C3%BCk+pdfPDF link annotation
    • 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_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 11180 bytes
SHA-256: f98a60fe0c4ad0fa07308396afbefb78033481e25c78c3c1a90ae03d1f682182
font_02_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 16728 bytes
SHA-256: 35f12361c8c1744175a04e7d6c8de95749b901c070b92d23bd30e998f1537e1f

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