Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393abb021927587…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 22:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b003820e504330ed38febdf242144548 SHA-1: 26d853e682d85d24c9192bf987691a0ad9313b4b SHA-256: a393abb02192758752626b2b8c6d2a1dd8faac5d242d383aab4fd02b6b27a6f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=devil+may+cry+peak+of+combat+apk PDF link annotation
    • https://wangwangcamp.com/uploads/files/202109092054031935.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/vufafidexavibusofaka.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/sazotuluji.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109101212167036.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/10776540086.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4fb2ef92c346a42a0cc62fdc6ff3fcce/muwogulebo.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/belefibidewikabopupozuk.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bufajog.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1l04mme5od179kajl346g1bgl2/dupuxiw.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/13193590917.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/ruzodomara.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/98595353375.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a724c35fc3---bipaxadonesedevazisutali.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/zenakinaveven.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/68239112920.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/53975997303.pdfIn PDF document text
    • https://stopserv.ru/files/file/61858950552.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/10466240081.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e85a07df---saxefulumesasuvaduzal.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/35253788037.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/69322602352.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/lufukejojiwisogazusoru.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dukedisef.pdfIn PDF document text
    • 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_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 20040 bytes
SHA-256: 8fd45ff001fc1909bed8ad36d7a6f28a368b2b57a66684d1701d5709c33668d6
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10784 bytes
SHA-256: f8f6ab6f7629b06f3896b5f56fc3deec5682387058980b3734f1ed1e46cbf622