Malicious PDF — malware analysis report

Static analysis result for SHA-256 b537dcc417ec0ce7…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a93a7d4a8d75364bfb627e9540e6de3 SHA-1: 1f02e32e9bd6a82797000a23e352e2ef6c28058c SHA-256: b537dcc417ec0ce7cc86e44e3c330d339cbea76b070f0ca1bc590a97ac07e57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catbasailing.com/upload/fck/file/68101499859.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd962a635---mozokupomufev.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3650aff5373f670a21ebd33bfd9a9dfc/vaxanakokapeneki.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fafe0936---nijosegogu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6fd329e1---31983985612.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45c206ed8e---73331346561.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/418e837c9ef092263dc2bc15c7f64a65/lakivikinokepemavozepov.pdf
    • http://dambi.pl/userfiles/file/rogudobebozasepinok.pdf
    • http://nomorecpapmachine.com/userfiles/files/werezimabojis.pdf
    • http://amandamaitland.com/images/file/1833137351.pdf
    • http://kmkonsult.cz/userfiles/file/kelemasunamige.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d54a72bceb9831930c6558edff3cbf2d/sumigiraf.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/69578107720.pdf
    • http://topoint.cc/userfiles/fckFile/20210623100924.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/9695997685.pdf
    • http://esoftland.com/userfiles/file/lufazuvimeg.pdf
    • http://flynewsletter.com/uploads/file/68077938872.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dbb07b59f---37396046349.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac599f79f4a---mitakuxixavizotet.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f1a71dc4---tojopijepowe.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/98e61eacabea119e2d5fe046eb837e58/safunaxel.pdf
    • http://dietmoitangoc68.com/upload/files/59170992529.pdf
    • http://csc-028.com/userfiles/file/20210625103433_uyw5bv.pdf
    • https://damsindia.org/admin/uploads/file/18964892342.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709e0b49c9---78401082928.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/018e700338a1e63f453bb5d9e4efb10f/fudakedigeganisor.pdf
    • http://labotinnghia.com/img/files/29518685418.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+betting+site
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb10.bin
8e3d76ca3df6680cd6b213a2880492922e45d2b7de6a56eab76329f42c7d41ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16768 bytes
font_01_sfnt_off000126ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16792 bytes
font_02_sfnt_off00013ec2.bin
7c07857eaeca5d53a9d454add652da9e4d2a039bd929a228e60ee439a793d4be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC2 10156 bytes