Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9bb2892890dd4…

MALICIOUS

PDF

94.9 KB Created: 2021-09-10 18:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42b7b60e3b154134472fedada33a4d38 SHA-1: 5d80d688c303fa647157283aad82de409eb551ba SHA-256: dfd9bb2892890dd4399a59c7e167cb51e7c4048c2a320885e5536092225ffbd9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm and external URIs points to an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://steakpluspizza.us/userfiles/file/69572008683.pdf In PDF document text
    • http://retailcop.ca/files/katukigagabipome.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dazugemusupamonulovuvijis.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/54302122252.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b8349a0ec79a0ebee032ac988ed4fca/vodinawexegejevezere.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/besawobokozafom.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/11301330904.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/18382946025.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/90972336512.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/fepebawobabojev.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/jijopususurojumagutejo.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/maxapule.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/fekoxoxojenebugisaxizetu.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109072348279309.pdfIn PDF document text
    • http://tyextractor.com/d/files/6895819822.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/65754121038.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb42d532b---18185938203.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210903_022223.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161354bc4a048c---zewevekop.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/begifejonarap.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/29850183773.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vetesunevirinodamo.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210903084850.pdfIn PDF document text
    • https://red-adlay.com/upload/files/50400924810.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/zazutovofulanu.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/12539130122.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/58604471180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=percy+jackson+and+the+lightning+thief+book+downloadPDF 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_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 19244 bytes
SHA-256: bf9ac5cbce7cb872597dc4ece030a6db6083242085494208feea3fde89cc96bf
font_01_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D0 11320 bytes
SHA-256: ded616423f74c1575e74ebee6f6c2f950e845acc1c20548c5a8a88ecc2d020db