Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc566da6cbfca02c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 07:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1444c4f9a68a2198984441ae099af961 SHA-1: 355b56eb8d915c5fc12fe4c46cb1853b45349894 SHA-256: dc566da6cbfca02c0ae8c207b372c39e818c844f84d768094b173d2ec3746499
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution lure. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://elektromig.pl/userfiles/file/pukodifagozigur.pdf In PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunudevonurenowovivakita.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zokedolupaxopufip.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xenamed.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/72576971993.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zalogepufemerudid.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/33667747319.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/29335809228.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/tufisirasovudupale.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130970f08716---18338404880.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/198d6d193bcbf754220ffe40a15f025c/34817540715.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35640649225.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/20931013957.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tesoxul.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/33186228242.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907170910.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/65646746274.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/88717854742.pdfIn PDF document text
    • http://boldogelet.hu/media/jaxedexozoguvaj.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/7974166757.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133155fc3274---nazibe.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/79553591845.pdfIn PDF document text
    • http://ihdbd.org/upload/files/69807666255.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/bokutajefuteter.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/mipumeredomadux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pato+player+apk+2021PDF 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 17824 bytes
SHA-256: e89ed2bad2064d4a7ec7b4d5b3e501256bc68113eb3fb6140516082acb950e87
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10380 bytes
SHA-256: d53c4d8bc1ead0c1227e1aab25ddc890d06626b576e62ededf54f5f135535520
font_02_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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