Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdef2b40e386c2f…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d4b64fff407d890fe54eec2d42d72ff SHA-1: 29c81c1fbc0c6795b7d5005e4f28735ffb874ff3 SHA-256: 1fdef2b40e386c2f1ce34dbe3ebe58264d5360be44217fccbf1ffd650b391095
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e75c3678---89552235744.pdf In PDF document text
    • https://zivotzaokny.eu/res/file/13321897065.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/monuramatasiwav.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/49384660836.pdfPDF link annotation
    • http://mariondhuique-mayer.com/data/file/88492173531.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/51875782653.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/merazobogozideja.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/74592325262.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7l9ijaq08bbvnup4mvv6kjp61t/6040847833.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a7148e520c88038af9ee35954be4bc17/39338260727.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/punep.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/234095855.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319064321361.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/fijoresaxagigoreduw.pdfIn PDF document text
    • http://klaaswester.nl/img/file/48503737307.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/96087969486.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/50879771456.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/16a967f7124858b3abf2b39a5bb7adc2/kesukafudolabofawaz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5c41d6ff---34406148514.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/tewomakumamufuvaw.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29640237689.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/77045821976.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501a410bc4e---betetiwizo.pdfIn PDF document text
    • https://unstitchedutilities.com/files/file/79029063251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pizza+bagel+cook+timePDF 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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 18092 bytes
SHA-256: 05898a6f3e7fd1f1e64ee59a0978537b9c0f306627b16e5757f6a292320d2157
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 10492 bytes
SHA-256: 15a29c96c1207c3835ab0e25b92c922238924165ee263b5b677a52b4888f8d31