Malicious PDF — malware analysis report

Static analysis result for SHA-256 addb2c8942d4b6ec…

MALICIOUS

PDF

98.1 KB Created: 2021-09-19 04:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 025986e29f5a2823e7d8c855c0782864 SHA-1: 149256c786bc0b63edcff4e49258be641870f4c7 SHA-256: addb2c8942d4b6ecf898d4d1c59af4b25d913d3882813f3a1af5012e0b622b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cioccolatogallucci.it/userfiles/file/53316366168.pdf In PDF document text
    • http://administratieindex.nl/images/uploads/42465650303.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/wusopuredasojerozinedu.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gisepepefibuxu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/97479925500.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/pefabasexitog.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/72635872655.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62949001825.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nuluzimifada.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cba6a1834---kijakukujinukebosigomo.pdfIn PDF document text
    • https://fond.ru/userfiles/file/60360832284.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/zerakujoxeveza.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/41044305416.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/tadonijuwigisikajifafi.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/98547649422.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/54082656238.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/13142088030.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/xetox.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/3515420961.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417afbab05a---98024109072.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fc9d1fad85108976688a97605967a00/juwexagivejuzesimebigomed.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/bawumovido.pdfIn PDF document text
    • https://wittnebel.dk/file/fufaxuvixil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=japan%27s+feudal+eraPDF 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_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 19656 bytes
SHA-256: 9520875a6c476abc39e2fe5d852b6960f1c55f34dfefb4c280654ea4db2f7d63
font_01_sfnt_off00014b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 10308 bytes
SHA-256: 3d8b1953a447a15bc204bc5e09ec5768deccd588b8e074b8ed4af9d9d396df85