Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a78c8e35a7f5bf…

MALICIOUS

PDF

80.9 KB Created: 2021-08-11 02:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7b7dc09eff7913263f285484de9f585 SHA-1: 12beb30de6fa3ee1beb4770479a534a01f68a803 SHA-256: 76a78c8e35a7f5bf3406afe6af1e81bfb854da6b9acf785478e2337c43db5907
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dcbd6a4bc7f22978c700c2c2f5912cff/gizunikufugutiniwifuw.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ce9ea7b---sisisulibewuk.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kexogawivogifarujoru.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a2cf67c9c59a4c70a16b415871712fd3/jajeviroza.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/kifoxivinofidodusanatokal.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61426309806.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/81785197364.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/18843963276.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/eeeb22f63d77a9814b3fbc60aa0b9e6e/15439832236.pdfIn PDF document text
    • http://schokozentrale.de/idata/nawinagileweb.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8784602481.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/30921634627.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f14a93b347ad13562904e414fa0ee210/zugidasegebobofatopifar.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a96f04f9e---74908447812.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gaxawujosomazifijemewuf.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ltl4ej6iaa0qst01bjveoh1jp9/bazemibefopipe.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b15d9e4db---gubarutijob.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6952a62d---86504714717.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/16489882910.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuref.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/37b0331c8733812c5db47bdc71e7a816/27870306050.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tinubupotam.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/37420182745.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jozedigarumixupoguzinu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/46ve7es0rg299m0es8k7bmel8d/91120341453.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/83943957507.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc15f4b324---33584381682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=velozes+e+furiosos+desafio+em+t%C3%B3quio+filme+completo+dublado+youtubePDF 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_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 17608 bytes
SHA-256: ddd79920dedbedc2b47cc47f86c1bac7b7029264c72c42d108c0977e342b9193
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 11344 bytes
SHA-256: 0b665848df7878d11e0baf626e3c20ed5085051ecdacc511a273a1ce8ffead28
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1