Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27cce09931212f1…

MALICIOUS

PDF

82.6 KB Created: 2021-06-29 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1ce79eda8ed774d7d35ed4f143f7666 SHA-1: e11c07ba5c298863481541d11627e4cba70f5757 SHA-256: a27cce09931212f198af1524ffafcb3bafd685e7d809eb57bb8e8c63dc5b6be3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting that the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f86a02e258a03456d322716a57c43153/gawabesew.pdf
    • https://tecnibat.net/uploads/archivos/sowemivado.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/67490d8489ecfa0bb290cb68f181836a/momasuxutitizivezezunekob.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6add3ad9---70971368622.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a60c54cff---75009164493.pdf
    • http://alexlunacoach.com/img/editor/file/favajojoj.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/806103f7be93fc3456ed49e4e294293c/81462826199.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6fa00f7b---34858745948.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b137e6915---woxanokogar.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/tevubuku.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/abc303ee08589bbcdb3a4e483f1928c0/pamaxevafadaguzumus.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f578ca93d---60375044388.pdf
    • http://skyline1968.com/clients/74864/File/fidevodilidusi.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47c5285ff---84757047997.pdf
    • https://susta.vn/userfiles/file/valax.pdf
    • https://divinenine.net/userfiles/file/tesezefotivipawodovid.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074883b0b20c---zukanug.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ca56edc3---misejodofalovopifuwixefu.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01d4c251f793cfbd893a4651fefe669c/zanekugixuzepulofuro.pdf
    • http://ajisushionline.com/uploads/files/53757397453.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdf
    • http://macabrey-luthier.fr/data/Files/99314699106.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d463f15210a61a92397a35feb02a7fc9/28348902877.pdf
    • https://tecnicadovolante.com/images/file/jenixeramaxot.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/aeae598c79568cfb80c6689ae5d1e7e4/39349523558.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=soy+glycemic+index
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff8.bin
249c6c7e067886861635e7f045ec3df7b29c280c673d1538554c87730212a036
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 10476 bytes
font_01_sfnt_off0000f784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 16792 bytes
font_02_sfnt_off00010f96.bin
f5d5aa69c287eb0a6a248e6f21e9ad6cbded481c8d2b7029e8b55fb3bfe09230
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16840 bytes