Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea590df13e09895…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 12:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b451885e41cfcbac0ae86a29ca51e3fa SHA-1: e50dcab3e150bf7477d574d8d7d4595fba183913 SHA-256: 7ea590df13e098953586306f6494f5bf482230fc7e882b227394ffc202b736c7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the nature of the hosting indicate a likely attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7261

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://villa-carlshorst.de/sites/default/files/file/28994890879.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26a47237e---61777883724.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ih1g0ua4skpphoamkv2bn3fuom/xigipezodisifudov.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc381d8f235---50542861946.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/nubuperoganodawokekek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1bdd007e3---doxumujugowoluk.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0f615f6d38724bfafcc4c427dffdccf6/bepuxesenorux.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///82391372480.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4740459fb---12617623272.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/65353284583.pdfIn PDF document text
    • https://tepihtrava.rs//files/durajujatopoxojijefe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/bedimulek.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083edae6da6c---wawoxurikubamokisovor.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0280c03dc---fivuwuvibib.pdfIn PDF document text
    • http://qzgj.cn/upload/file/dazusulidel.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/pulodimef.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/tenukazinulipozomogegew.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oqb0vdc590lesh1irc72eidlcu/3609883870.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3610fa4e02537a68a79935133f522f07/jomozosuwujezemi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/zomawuwosubel.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/20036337410.pdfIn PDF document text
    • http://htygroup.com/upload/files/82895287998.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/lopesebatifutujuxaregana.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zonaji.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/55553340875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lowercase+abc+tracing+worksheetsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 10736 bytes
SHA-256: fcded10845491981819c714b6f4fa42d83640e87b95ff7bba6599c33a9283505
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16932 bytes
SHA-256: cfc39e5a3502fcdb9f57d2ab17098000a24982dd9c2251f4797c12609d0a5151

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