Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe3c165f1133e66…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 20:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cbdf587234bead17ddf4bb781652e97 SHA-1: 2c2c66819a030682a8947710b4a098973d21c43e SHA-256: bbe3c165f1133e66e00ecf4e5fbed5bb351e586a58da320a9b769cd91dec0ede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=fun+home+alison+bechdel+pdf+online PDF link annotation
    • http://videotour24.com/data/fckupload/file/wimikoxox.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/86163486789.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/limejiron.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/lufaji.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161313843b62c4---24059903301.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/16016707100.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kudezapage.pdfIn PDF document text
    • https://ptogel1.com/contents/files/sanuraweposufi.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/80795853707.pdfIn PDF document text
    • https://almavilag.hu/files/files/77047770095.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/65797972205.pdfIn PDF document text
    • http://mobiliteit.nu/files/12806791282.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ninebilevofubupib.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f166be7be---88912710430.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/goxurume.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336ac990e95---tonepin.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nazusoronilezitubodasape.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/24494365440.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/16911190655.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e963e7b5b31fb9ed203074353b7604e4/xamoxebinafuratoliju.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/sowasukifiwotem.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/duterizovuwux.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/71983877801.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/93232580034.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/79553669949.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 19928 bytes
SHA-256: 153d4142fa66e0a35ced7a083633dffe350a16173bef610ac7eb320ca97527e5
font_02_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 10904 bytes
SHA-256: 693397d1c11ef436719b101951b41484b1f15a57fe8758afe45b26ad861d7860

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