Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd2e16365d354e9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-23 22:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff93501285ef59284adca2591df88cd4 SHA-1: b366ba838ec3ed63435641cc3aa88151b3ae5f9b SHA-256: 7fd2e16365d354e92802aea4d97aa5bd67b0fad77fb2a94253b1b6cf3913e038
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings indicate a malicious intent to direct users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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 http://aquamedia.cn/ckfinder/userfiles/files/64972411629.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/kuvulebudidewixapav.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/waboza.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/44315024432.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/taxasexorebufedewafadaxer.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vivusuwoxudejij.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lemozolin.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363196b3fad---sudinomosevimuw.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/womuzaperizutireje.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ec8a14cdc247ee5b90a9f0ccc201db57/tiromubikoraxopavixituw.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/77468889847.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/32342886828.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ivu1p7ubumq69f3o3h0e0q4ccd/medura.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/tomenuno.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/11395091464.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nikopazolo.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/datamodakidonigirupipoweb.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/10274643509.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/82840718341.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/janujo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/refovunomuxesi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1f4b88d965b4e9995ac2be97862404cf/68334646156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+word+converter+free+editablePDF 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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 10592 bytes
SHA-256: 3c0a9410b40ae39f448d288d711954def9b1d79bd38646ef64ebe1658aa45e41
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1