Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddf10e1af17db63…

MALICIOUS

PDF

101.2 KB Created: 2021-08-01 06:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3502ecb0a6dfea0558cf2ef8ffb28665 SHA-1: 0524fbc1ef09508b8902cefda8b55bab07d006c3 SHA-256: 7ddf10e1af17db63f826ecad8bc111d6f364dfe07dba18cb1509fe90e9196b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kaowei.tw/image/files/20210601_032629.pdf In PDF document text
    • http://bundoreh.com/fckeditor/files/file/61388825139.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/86044968766.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/bonubotunaredozadatuka.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67d21296c2cfbb9556a47ffdbe277b2/nibozadeg.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eon6lq6gpaq568ke0nm34leus5/40489981235.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa7ede0ef---77065187446.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/95908992901.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zabopagadom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fbc79ea045cbc3202397c17577dd160c/3211943014.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e490c01f4---pikewapozudojoxaxus.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc07920b5---divemorevurami.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e730ec84be9d78a2273e0259760827a2/pifipetirenu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/28321131554.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc7b7ce99---betuxidaban.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/749c8d3d881f49c8e797a27819140d98/17875920419.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffda48e4b7f---43174397871.pdfIn PDF document text
    • http://brlairport.com/images/file/22841981903.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/rilikinamatobinagege.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/11600780981.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/pexef.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/19753382132.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895b8a96907---19381918868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+btu+is+a+22+kw+generac+generatorPDF 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_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 11172 bytes
SHA-256: 3aa57cd653a9eb5eb0c933adb855d5a7b5381ab220c3d77ecedb5c6d4481f84c
font_02_sfnt_off00015699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15699 17932 bytes
SHA-256: 18861de7ae8668ec8281ed725b179cc30a8b66a2f4751743803c24a7f4eec5c7

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