Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fd9847ba86a046…

MALICIOUS

PDF

91.3 KB Created: 2021-08-02 05:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10afaa277f9c6ee13bf6d0c6e012341d SHA-1: 640533ef1c935453ac895b1fdcf3c2ad2fd006ac SHA-256: 62fd9847ba86a04660c1b7208051a0577ca841a05d0c7201dcf5a88809bfd665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised CMS uploads, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e579a12bae---sowaposatiw.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pn8k7r7augm57mavbpc3tj2feh/8685988217.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/3683678724.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zelep.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/76581834332.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8326ad4cdd---85381199214.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dqlp0fsf7joilcuqqjgd3idsqf/lisibuxafitosukalif.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/minafononi.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/derulusuzaxuwuri.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/bipelijule.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4cb4a0a887363f7377e683e42e87e790/belomibe.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/3503546395.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/30f97f15d4ad1738de361c4f355387a5/27381883344.pdfIn PDF document text
    • https://bfull.ru/uploads/files/41094160145.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/47378574980.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609665b82012b---mawivifotef.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/denika.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fb256b7696bf9458723e5f1264875206/sajulewotifitaxub.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4899974482---xolafom.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/62361476457.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jevisitib.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e6b8ece32---rivikis.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/fevojukedokivufig.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8gh2gl2ef88pivh0h0q2vl2vvu/62455457826.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/njqg9g256o5u7c6abb0b5ft8or/18709313136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ace+academy+handwritten+notes+for+electrical+engineeringPDF 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_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16848 bytes
SHA-256: 19f3384b572e417e17ba23a9bac7cc860f47ff92a6aca9e829479f898b2e91f3
font_01_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 11104 bytes
SHA-256: 9d5d3e8d81af85edf9241d030a36c92f2deac0fd5f08c96959ed7f87e13e1b88
font_02_sfnt_off00014509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1