Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec377ad4bcc5d3c…

MALICIOUS

PDF

80.0 KB Created: 2021-07-16 12:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5000f8b370855aa81e6f4c916618d22 SHA-1: 4881ed95d9a8c50c7d9b447ff0de595d155dd585 SHA-256: fec377ad4bcc5d3cd6003beed9b9d65eb7a1f3067764d0e0644eeaab7ed2cfd9
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it is used to distribute malicious content or redirect users to phishing pages. The presence of numerous links on disposable or compromised hosting indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9005

Heuristics 5

  • 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
  • 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://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgfbq7077lvdh8e41vk3hu9s7m/15770569529.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d213bc33cfc---79102152912.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/63608505406.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4ffac1bca4842488c30bdc57209727e9/xumepomuwugu.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/wegigew.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085514d89d70---80763268145.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/4329601962.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e649dc3711c233e11a7b8ec8c59f0574/59963858626.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/pojefimul.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/wuniguporozorejumi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc792190c---30030667598.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757bbfd5fa4---wubovitarojebijofev.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17f75540c---pipubumigejowokolopu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1fd8a85d53e349ca7ed3f9d8e816d538/gufabodoxebek.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/rabumik.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/77557897910.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/62f9e74e40fb4a0ddce08dc4908e4c8e/13851776560.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/69036284688.pdfIn PDF document text
    • http://canvangdientu.com/images/file/26749056255.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/bexonumubuketurovurexamuj.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc03c4199d---86418199598.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/wosefupipimugowosa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb0d557207---tugewanebaxukelibinapib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+ride+a+horse+westernPDF 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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10376 bytes
SHA-256: 1515c270d2f1259958e5f3c658c94c6e1eb86b78e3cf69c59d07e5ab7c2ac8da