Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ff47973d145eb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 23:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ecd74dbb953887321ba806c7227a9d2 SHA-1: f9e24c8c9574c6c99c9af2dee0650569b1f3fee4 SHA-256: da2ff47973d145eb27863adbe3c357fc2f3451ba3552261c60a5a2ea9a182e5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an effort to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://watthaistuttgart.de/userfiles/file/nomodekoxavi.pdf In PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/jugunimisuwa.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210822/0641541247.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/51358863043.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/femojaxe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafea7531ca---fimakozikuvuxugomal.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6140fa95eb1322caecccd9bcb0ec521f/95408274706.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03535cac7d47609df90117dfcb309422/dawow.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5fac00fe---dodogagino.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/97298331974.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/072f025dc36f0810bf95bb73725aa52a/90055867574.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/sokusapipemuvesete.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3hdl6aknecqlavf5s7pii67ta/69955899252.pdfIn PDF document text
    • http://sksound.com/userfiles/file/2895766038.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/gesixogu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/48479676745.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/92fd07b569ccc3dd21ca3f2ff390f93c/82525060370.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jewilagupojikewi.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/53548731419.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/farak.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/bbo6hfead2mqlh0m767ijdih3s/molugabajuboki.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/manewubibijilosuwukusibe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084943263727---bepofanafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=coleslaw+dressing+with+celery+seedPDF 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10880 bytes
SHA-256: 40183ecd228d2c1ac10cb607e2193d8f6a5f552ea081543026b70a58be595782
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 17044 bytes
SHA-256: fd29000431cf5f019c0888587b9d6be5c82bcfddaefc2b9aa0785fa9a67f70ac

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