Malicious PDF — malware analysis report

Static analysis result for SHA-256 686612e570b823cc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41d9973aed269113b54f53a74de58f7f SHA-1: bc0c6bb60a8a9db93d2a0c0d6702ef855826798a SHA-256: 686612e570b823ccc577ab3de6c685c25c0a7cc3d3fa92d00ae6148c8b94d3c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chuanghuilaw.com/filespath/files/20210905045521.pdf In PDF document text
    • http://klubalfa.org/img/userfiles/file/3417437206.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/maxiberamalunidudi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/patatawedewolofizeke.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210905063522.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kulonetat.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/6536617552.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/31907814888.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/40331140702.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/96526416184.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136778008b87---gafekaj.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/dituxebafemuvorozo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765a9e5701---60147296441.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/goxegotefufovul.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rafixelimemumuv.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/navan.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/sikatezatana.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/riruzizes.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/fakedesimu.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/59606074085.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/93618048881.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/rubaxog.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/vizisuwew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+one+featuresPDF 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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10384 bytes
SHA-256: 3913289c3676ff9327b1ed274a7188399efb629bb65994e956ca11ef67e042b0
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 18088 bytes
SHA-256: 5a7df9295297ac211cc45ec03cd960e4b6b3b4563ac44f5df1b3fb845cc311da

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