Malicious PDF — malware analysis report

Static analysis result for SHA-256 439717d77e9ae6d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37161a3ef77e01d2b974676b1af079b2 SHA-1: 6c95248aa44fc3510fc35cae80b071374b852abb SHA-256: 439717d77e9ae6d528b257d1aa639f5dd65b88713bd311ef6023f95df920cf88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rajaketiga.com/contents/files/75670839121.pdf In PDF document text
    • http://larben.cz/media/images/upload/file/75296121595.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f53865a6---menogedukalitapomux.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/wewutopaxaregeta.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/57519769461.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/73055276125.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091101111587.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/forenav.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gebiwifudupozewem.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/20075778995.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/64601118105.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gisofejavuf.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/3956762804.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/7256866838.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/22909769314.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/godebewunivik.pdfIn PDF document text
    • http://checopharma.com/upload/files/66465027225.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ac92d28c---20485632079.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/mevabibebevijoxovivedunu.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zijinozojomiwepaxinotex.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xuriwubinuzodafe.pdfIn PDF document text
    • https://ms01bet.com/contents/files/nuworelivem.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/42845898068.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131656daf037---19268241722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mini+militia+hacked+version+apk+downloadPDF 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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 11016 bytes
SHA-256: 32d259d791d2aea8fc75ee5ccd29fe972441003b2fb354fe663af40ecfe955de
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 17876 bytes
SHA-256: 647690a9484fa67caeba8abd66cb1f57611cf3012247b820ca8abd75c6c877af
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1