Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a781bd34732a6f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07d6ad331cec020fdbb4ddfe216eace3 SHA-1: 341310629b6218591e365ac56ce1b1197091959c SHA-256: 63a781bd34732a6fae125e695fde3665ed883288456d9575ed91dbe7545089d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised CMS uploads and disposable hosting, indicating a tactic to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://koryosushi.com/uploads/files/50485842807.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b4f91f6239da6e310a7acf8b46672bf2/65919689852.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/pijuwulinujemubodiba.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jufurujus.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/62078842519.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xezab.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3e46b9df8be64ded5712d45f66f682d7/sasuvuvuzutov.pdfIn PDF document text
    • https://actor-conseil.com/files/file/61916283395.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/gelamudumelasejo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/27952899391.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6360efa06---78067239189.pdfIn PDF document text
    • http://netshopnepal.com/userfiles/file/rumuxowikewatozuvabuvuzoz.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xolesemufoni.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/18k7ka0mvd2vi3tll453os33t5/4537555213.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/tomamogagenadini.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/gakaxejinizonupimu.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/ruvus.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nufumitapiruletov.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e7a6a6df---66612056781.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0bfc7ef58d3bbaddd5704b2cf0d9b2da/risesitepovifawobobunonol.pdfIn PDF document text
    • https://cian.hr/userfiles/file/xulekavulime.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d0b6fd083ae5aa6b704f52e1b73d2706/guvewajebu.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/4993933831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=baby+girl+names+starting+with+letter+n+in+hinduPDF 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_off0000c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 11068 bytes
SHA-256: 42f3dc3083cc348d52574fa9c1c1707e9f3720f0a53849b411c71c21fb6bf2d4
font_02_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16248 bytes
SHA-256: 83bc9f5dcde9ed324acdf1411edff654ada2ad2de43e5a03ecdb5113928dfcf7

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