Malicious PDF — malware analysis report

Static analysis result for SHA-256 f531f0575355f627…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 10:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52d8ff8ac801349b0510f6a298d976d1 SHA-1: 53da49eb6a5c7e36acdadd481a8407a40a47be9f SHA-256: f531f0575355f627a35c0fe88e429284c65c08a2f67d501803c14bc392cff079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a malicious intent to redirect users. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest this document is part of a link farm or phishing campaign. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=best+video+cut+app+android PDF link annotation
    • http://righetti-ticozzi.it/userfiles/files/32408154330.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zunareridevoxegotoxogowaj.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/70161288145.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/2667029253.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/29510925740.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/6713596782.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jikorosel.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/9116392197.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090701114378.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jadoxu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad210366a4---99960549957.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/64162803825.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///javusegekonadopezijutaxi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/28151589743.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23bb10548ba4c6b017b77d55184ba56e/gijikigefo.pdfIn PDF document text
    • http://hengtongblower.com/d/files/4686153631.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/596309895.pdfIn PDF document text
    • http://balalajka.nu/media/94169301202.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/36201333469.pdfIn PDF document text
    • http://z500.si/files/tifufunekeja.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/taguvizivejaxenozemobu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ea7a0f34d07a564cf8189490ab4d8484/18580285188.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_off0000b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 17052 bytes
SHA-256: ac64fb64951dff49cf9dac4aacbf5f44a7ddecd55d9bf49fa58c1614e568dd67
font_02_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10680 bytes
SHA-256: 359f4aacec2fe589c03c4c1665274a633684c4bc4e95ec40f62184f254c5a4fa

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