Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfd3ce869d2f9ae…

MALICIOUS

PDF

63.8 KB Created: 2021-09-05 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 313a47aed0399b8c0f14519a3a657c47 SHA-1: e758c3aa2c9c9c62148415eb943253df066098c4 SHA-256: adfd3ce869d2f9ae399ca8824457c6103488aec91869cdf70c0bd5f380cfec42
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution vehicle. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The file's structure and numerous external links suggest an attempt to lure users into downloading further malware or falling victim to phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8378

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 https://huntic.ru/uplcv?utm_term=answer+sheet+pdf+file
    • https://kaptenhoki.info/contents//files/11214712388.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e832eef48---58559309796.pdf
    • http://syarmarka.ru/userfiles/files/87807331779.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd14c9a474e---gupatibafux.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0ok05khkg5g9ie3425q8ncvnv6/molanugavexaxukim.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c43793218---82053944122.pdf
    • http://kashima.cc/userfiles/file/10186035491.pdf
    • http://around-sicily.net/userfiles/file/83195105944.pdf
    • https://anmoul.com/userfiles/file/31054592450.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6e06bbd2---31547997237.pdf
    • http://casier-a-bouteilles.fr/file/37078092411.pdf
    • http://allprintusa.com/admin/images/file/63673582798.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9pi08kbtln30p072ppp39lu853/fagazi.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759867c6bad---86916097820.pdf
    • http://adance0112.com/upfile/editor/file/69464796352.pdf
    • http://hyundainhapkhau.net/upload/files/gavimapojupigefizedita.pdf
    • http://ediljolli.com/userfiles/files/tonerivawotimil.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f36d7d4a---rebulivunanujosofowe.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/046f5e91cf3aaecb1580151f9e4bd268/fopukuluvegiwekosi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d602.bin
d321a17c1e544266ecfd2259b4a9edf3ee581226f72679d67491e4456bce6cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 10380 bytes

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