Malicious PDF — malware analysis report

Static analysis result for SHA-256 0684bed467b21038…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 23:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 019504f7243e522f5d1f2e8c260dadaa SHA-1: 8bab036888bfda59c03a000c434787ea441a69d4 SHA-256: 0684bed467b210385857b84070bfb50868adb983b56bc485040df0be1307afad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u3cku3hro54t5o8vi366curscn/72440767533.pdf In PDF document text
    • http://moiarchitekci.pl/pliki/file/47356136885.pdfIn PDF document text
    • http://partnercable.hu/files/95267573116.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/polafegezivonut.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/83567016667.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/94158528717.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/seresekane.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/87455814733.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/fixovatuneliregozuz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160771de38b256---65507490727.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f5f1d528e380fa3ea4c34afc9c2f317/53269608344.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s3sub5tqcioaa2q091u3rbj52q/vadux.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/92330231583.pdfIn PDF document text
    • http://jar-ted.pl/file/rorinopoxikudesoxazavokud.pdfIn PDF document text
    • http://m2m2design.com/userfiles/89949812360.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/28113780946.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911414b603a---55765849038.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/lemedezuresanodefilizevo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f9f55d0692e708d9b766fefd7105254b/vewetibunokezojaloni.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/93496347611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=statistical+quality+control+montgomery+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 11396 bytes
SHA-256: d68c76a174eb6610be3c17157dfc3f4c547ab9f0e2cf1fceae3178dcfac7e158
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16772 bytes
SHA-256: 1a4ecad3ab0d33589393fe0076095a04e47c8bd8539f15a686444f4879f51bef
font_02_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1