Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4ebe79ddd9afc3…

MALICIOUS

PDF

75.3 KB Created: 2021-06-29 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d994441132d9035b7280ec809cbfc905 SHA-1: 590807a8eef6e884053b8be0a973ce4f3c4b265a SHA-256: 7c4ebe79ddd9afc39ea31e2013f49e75021bfb4dc606f581511c2d095f9e5831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure itself is designed to host a link farm.

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 http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fbf28248---41290440405.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4ed38b975ed852fb492755144a1d97b/fepuwamowipefenufurol.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f85de01fd5---80147899516.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/fb718009f2db03097de8e560933696a8/lujefa.pdf
    • https://netshopnepal.com/userfiles/file/91840367353.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cgq6cjs9ucabm5qrbli521ivf7/mejofeduvobiniseteli.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/49hjr8iqkc8539tde211s953as/80568690076.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1e6b7a529d58f0a133871719c0890472/kewoxeribizujezufukadoto.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22556d659---sugepa.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25190e235c---83811864271.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/93fef69b8d1e237c45d865d14f34c628/12901154975.pdf
    • http://grandinhr.eu/images/user/file/72348805255.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160890d5674e97---34244562507.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0b0688d80edff9effccb7f2707eb61f/kasamifobekaluxa.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/jinilodalozesomufuxuda.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a54af07cea6---77897991338.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d20e0622c804ccdcdee2b80541461c90/63116671008.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c62560098a3---6150305244.pdf
    • http://mg001.cn/upload_fck/file/2021-6-16/20210616162116212308.pdf
    • https://bitree.com/ckfinder/userfiles/files/74675860691.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0084345ba08a89f6b81f72e2f95d7fac/nesafumitedobakinaro.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a267d7b07---feguzibepokonabikixilibov.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/28a92c2290aaa9f7a22799f9b5ca2743/24008667382.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=my+your+his+her+our+their+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6cc.bin
63646ae15490fc8b96a82d68d1b70deb7289a44236cb5412a655e4620f472cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 16120 bytes
font_01_sfnt_off0000f087.bin
8a44bdfa0b169794991889e4b4dec3d74aa39617f6bbdc890b4e45979dce7bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 10280 bytes
font_02_sfnt_off000107f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16792 bytes