Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dd8cb246eeecf9…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 01:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daee9a6f0ba7ee1e44a7afe95e703859 SHA-1: a9600739ae179a8cd76ca53f432f4d6d02d584db SHA-256: 53dd8cb246eeecf9c1136afd2000f1ab3d882e9df4ad850e577a80b5fac67e9a
126 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and heuristic firings for 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1919

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jidew.pdf
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/lawedovopiwejodadij.pdf
    • http://wellfoto.cz/pictures/files/bigovawujotokogiwidaf.pdf
    • http://murielbellhomes.com/userfiles/files/mafipavuwidila.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/84189705939.pdf
    • http://eprdel.cz/userfiles/file/76120169713.pdf
    • http://becucci.it/userfiles/files/paniropalifupupulu.pdf
    • https://ndmoyun.com/calisma2/files/uploads/16024729214.pdf
    • http://faizleathergloves.com/userfiles/files/bebewotudodejovipimiwog.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146357bac13f---7711294887.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/wibavidakexiwobifisasuwop.pdf
    • http://yossy.biz/userfiles/file/44920000196.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210909_9D505F4E1B6257D2.pdf
    • http://finance-bulldog.cz/UserFiles/File/tutoxejowemapodipokovagug.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f361ebc336e2e00997ff5e5e96fe0588/38753631649.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/pasuvujudosamupudisikula.pdf
    • http://baobianhkhang.com/upload/files/zevutukanu.pdf
    • http://le-bouquet.be/userfiles/files/lilogajipu.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/ratubukufufirokazogo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5d50af34---65007236237.pdf
    • https://greenlandpark.com/uploads/files/87556724641.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s7lrva41ivt4q724fdlv8bp487/wufoweweronuzuki.pdf
    • http://starroadchina.com/userfiles/file/gesozodudameluvibenepuw.pdf
    • http://elma-itc.ru/!upload/files/81563131159.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibemusulesuxinodegoj.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210915_FAFDEE7C27A4AA26.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mathematical+methods+in+the+physical+sciences+solutions+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_off0000b3cf.bin
ad70f78d4647bb40ce013474e028f5ed71cab9643a9bb9790649af766c89ade3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 10992 bytes
font_01_sfnt_off0000cd32.bin
b3ef2dfbf3ab0579a2df164a6e2568171d35dc1790c40d2027039af7a8bc599e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 15628 bytes
font_02_sfnt_off0000f4ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes