Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d44b18f3906bf6…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 05:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99e6a8ec88dafebc693d694ef9a17e2e SHA-1: d1ebf63bc8cb2cefff7c7040e316e0c48646c4a9 SHA-256: 77d44b18f3906bf60e407f827b1380cf4cac44e1fe9ffa9ae823af4894711248
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

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://duszek-lasu.pl/userfiles/file/nopifinitapigu.pdf In PDF document text
    • http://machin.kr/userData/board/file/17601392527.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0974f427aa3f9fded74f361ed5393c29/lolapofubujuzi.pdfIn PDF document text
    • http://maihome.hu/admin1/file/83932802013.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92b56f274---vavowavoroxatinozego.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/45623546143.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16254074080965.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051eeb4eeca---71750009056.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/libuzeb.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4ca2e2c63d85c1c30bf981a63af5e5e4/13584357434.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/goliderexibudi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/69707895348.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nibunuwilududajumipuz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f264b718---paxidapapix.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/81818828702.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f87e208b2f51eab88daa5e442c02a628/76109899930.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/13975261677.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/064c95062d7f4417d56f2ff55f4ac9fc/bagip.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/38568643645.pdfIn PDF document text
    • http://parentini.it/userfiles/files/50834390694.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610fcb2529ca0---82413410422.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/82753718672.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/nozowevanutovuxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=american+horror+story+redwoodPDF 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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10768 bytes
SHA-256: 5f6c3b9f86c5e852f30a22f8367f211c3ded54656985f43f1c1f193989d1c848
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 18316 bytes
SHA-256: 35523e07a79b13b2de6fdf02df278a8202f627f4b95eb357f192c4c7d34b948a

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