Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b41ee730258fdb8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da8e87ee0da85c3a5a3401494129c3a1 SHA-1: 07468844c79949e13d259b692a36e00aec6a7a2f SHA-256: 0b41ee730258fdb8a2272d4b97d9b10ccc58da5c294cacc2d4eac7b48475b7f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=individual+differences+factors+pdf PDF link annotation
    • http://vamaconsulting.sk/userfiles/file/vasuse.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/nasexenibakamexekuxaloj.pdfIn PDF document text
    • http://mfahk.com/upload/files/dutonizeparufupu.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/dinesamulubafaxamajun.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bc22bf175a232f81a39f6efbfae3be7/14993571645.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5lvp2bn41h027slmhr3jnh81va/zunewedetekam.pdfIn PDF document text
    • http://redactron.com/userfiles/file/87135671750.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/81274641392.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/552d71a47699415fa319f9141865e738/53353925928.pdfIn PDF document text
    • https://tomas-music.com/contents//files/15276814901.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/96687731570.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/paloke.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/luregivixuwekuxemeso.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/31027887259.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/dbf2fb0dbacbec2c3a40eede6e501c69/47425291218.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3771e1291aa4311c8339c235803ec138/64937497509.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811ec3c9f4e---xanalazotabemisutopasos.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/72939439428.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c323928145f---87860702272.pdfIn PDF document text
    • https://beltamas.by/content/Files/kijiwiwewapuzopojetusadef.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254cb59f422---31626180728.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253694506c---38267620000.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10732 bytes
SHA-256: 15502fde92db391bde3f126349f982817e2afd9e8fdce06829d45db77f267022
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16488 bytes
SHA-256: 5070d7f14bf701bd56ae3e02dc7bd75f856292ffd0c062f5a9601583b7be47a6
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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