Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1719858391f95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 15:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46c48075c69255510496e4a3fd447f00 SHA-1: 9f5b4b7884b800eee57ca2312176a07cd26bd9f5 SHA-256: 85c1719858391f95df41eb15b2928d7d80896aedd184cdc4642ea743e6b2822e
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised or disposable domains, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4435

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 https://blnk.eu/userfiles/files/rositop.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ef8e793ef2635bf0a99ac03942761a86/2517442004.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/jetazitisarodirul.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///84558591677.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vawebe.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/wuwariwumukeveruta.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gegirozezuvedareput.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/12025423422.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/towuvoxukafazemidoxedisi.pdfIn PDF document text
    • https://tonitomov.com/picture/file/mogoveloxonetolavafekur.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5423edfedbeb2ce62835258e8391f5c/zujozatajisaxax.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/g80gm7j5td06m248ubn26lcgpa/domilumametizogawig.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/fekuw.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/87495063828.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wujukomaw.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9c870b7e2d0c0514c04154932cdcd959/60939427101.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/3fc598c0d7eb0de8e6abeab17eda693f.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///fimimupimosobarigavaxeji.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/guwupuwum.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0c4c7950---51379489659.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f3be970def50dacdcbcb67e0a4b50ef9/vaxus.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/22330943974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=los+arboles+mueren+de+pie+pdf+version+completa+gratisPDF link annotation
    • 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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 18968 bytes
SHA-256: e5d09d997267b67e1887c5b8c25db9ca78c6f9924f09c4379b31a102975b2a40
font_02_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 11224 bytes
SHA-256: c391b22a980bccac77eb405ecb75706dedfd2792bb739ec1d313e3ff0802deca