Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d541eeccea3c84…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 10:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6cb20e38696bf99d9a418fd7dc6dff3 SHA-1: 69b4b6fbb9a4af7deb9b502853f8d6727e0b140c SHA-256: 42d541eeccea3c8460c2e8fdb3cc861243bfbe2c3407f64f1ee5941faf160362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lotusromeo.fr/app/webroot/files/userfiles/files/vorofev.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/kuganozofud.pdf
    • https://picinterior.com/ckfinder/userfiles/files/57093488372.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb967c24c8---48210465814.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a6e7b9c3---40752451546.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ebqau4t5n6je4sjudgc7nkme6n/moluvewap.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a4cb4ebb8cb1dd36bada86ac369ad1aa/bizaf.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2fd528e5---muxaroru.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/danasusireleliwixak.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56d89dd88---zikosapavusom.pdf
    • http://elitvorota.ru/f/file/narofodanejedodobuzu.pdf
    • http://naturallymine-chicago.com/clients/867610/File/kadasukusajanabokovepob.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8496f8ee86ab5fb060aba80f7bb19d5e/56901376966.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98be5a06fkki6r5cu3rfqnbbhj/90491778927.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096a579b5cef---59952492738.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb726bb4c---55851615666.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/zorijogu.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d36387c04---99270394475.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a720e872cd0---fetotiduwovavukugobanezi.pdf
    • https://pioneerlift.com/upfiles/editor/files/fumudefepude.pdf
    • https://gites-les-bardots.com/userfiles/file/48356385085.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/03694fbe0c273b9b294d0e7614b00381/99344847736.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8a9d3c29---rafubojamezew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=definition+of+sexual+perversion
    • 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_off0000ec20.bin
67e54a8e2c8cadb17ad0d2179c99ade763d650a81c4a3f1e5ee0f8b419c94c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16720 bytes
font_01_sfnt_off000117c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes
font_02_sfnt_off00012fdd.bin
12ae3e61bd2f74c3f506dcf2462ad647cbdad1b210ab2a6d849fec9c6a030507
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 10620 bytes