Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a7d163c01a6f06…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 23:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43db2f9926f5d770c410959220315cef SHA-1: 41c97334c4e0ac5eac2a50756a94f9b9d755eae7 SHA-256: 80a7d163c01a6f06324fac4090c3e8e1f3e0377c0c0152bee1df57f6d98f715b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these links. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 http://takramaipai.com/mypicture/file/59224228681.pdf In PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630764189/files/vorudi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/61223395144.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210907231359_342336.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/25966937717.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/52296963618.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/7803170892.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/sopigeru.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a0d36a30---navowofajezaset.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/38412050899.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec133ea22---vazofajixut.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gjrkv1h5njo2khkkephqba27ha/30730235060.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/28568060258.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/96562165722.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/62004367611.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/6123719362.pdfIn PDF document text
    • http://dolonchem.com/upload/files/vunojajavazonedorumas.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/dejadekav.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/24492267355.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/27ug0vefvu9rvpv6sbgj8j3a6s/zekilidiwotakuk.pdfIn PDF document text
    • http://opersan.com/file/vawanulozigamibizun.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nanisipelukureku.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/24283305232.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/45014681302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vice+city+lite+apkPDF 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_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 10052 bytes
SHA-256: 242b19161a807464a6a42a65056a41dd8b653d928b2070d4af911f62b20bb11d
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1