Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d38ff92cf807b3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40ebbdf970c1c77290986747fb2b31f6 SHA-1: fd0d1257a71aa3ec61e3ae6d852f79c90a8b4d11 SHA-256: 89d38ff92cf807b319a470b469c6581d09fbfde2335ba41d4d32f1d8ee60ba61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=gta+vice+city+free+download+for+apk PDF link annotation
    • https://solidpractise.com/files/userfiles/file/85063836102.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac8d81225---72809009557.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa0bebe94---54012809102.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/xexukujit.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/61602392244.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131743b52fc2---37147492364.pdfIn PDF document text
    • http://prota.ru/upload/files/nezezafujaworironefuja.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/56836341118.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/61622720522.pdfIn PDF document text
    • https://cmoretv.com/userfiles/favavilojuxu.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/45837298011.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/78283150570.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/74038327526.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/ponirojos.pdfIn PDF document text
    • http://ccshecea.org/upload/files/nifoxikisozezojopisu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/jamajawilafek.pdfIn PDF document text
    • http://canadianrockies.info/files/file/49399468919.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/78509863869.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/dadasabedipebarug.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/56763442750.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/forirax.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/losemeposolodexipefi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zelodosafupukatowosatirev.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/24265963155.pdfIn PDF document text
    • 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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 10840 bytes
SHA-256: 1a337dfa47fac505ca1cec3f0f58fc9e2402ab1aa4bd3209fbd9c291e9dc9831
font_01_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16544 bytes
SHA-256: 595eea35c644d213a145158fec5396cbe640ccf0f751b6c505668ec7eec4f911

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