Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5563d4b9f7662ec…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 00:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b668f44501e5995e07f18a4c7740f829 SHA-1: 336ec4024efe6e386cee765710f76329b9c68cd7 SHA-256: f5563d4b9f7662ec6d02706a9c65c2e8ef78d1d3bbc09b0ffd8d8f44759758ee
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised domains suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/28c312967507d3fc1c66eea7ff4b6a3c/fiterubigutajiwu.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6d519981---19928998039.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/me3pshbq0775qm2bk71u3qep24/jexuroregu.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/89896606055.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/fozitaz.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/53656233087.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083782ce5b94---87962089878.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/zizipimijilupazodazi.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108181844015266.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/resowixidosa.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/lufubisegige.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/57444065159.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0k5jkioafk9adfqetnt80er9em/76935379111.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807938f9c---xafupofida.pdfIn PDF document text
    • https://birudongker.com/contents//files/7829760285.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e102b26e6a---pavemazoxigutefabofipul.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46188a0b---dakinawefusogafunofaf.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/5778503116.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nbag96b774av6vnllr3a8lenso/tikepokepasirusuvobapu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f190f9ed97---wuzibe.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/72520850326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=business+communication+pdf+free+downloadPDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 11020 bytes
SHA-256: 261d4107016433509c9b4d82958f2da6681bcfc23578bd82b739767f7c9d9e36

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