Malicious PDF — malware analysis report

Static analysis result for SHA-256 354f93f6eb0a0c83…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 09:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f71705e81e4e03386e4b5067cb6d30f SHA-1: 6df2fd553f14dea4ad96c79d581a8c41577d7c40 SHA-256: 354f93f6eb0a0c8342b728862131ed831ab993434aa5b11d158eee7e5b49a3c0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into downloading a password-protected file, likely to evade security scans. The document also contains numerous links to potentially compromised websites, some of which host PDF files, further supporting a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://megatex-plast.ru/pub/file/31989792725.pdf In PDF document text
    • http://superazs.ru/images/news/file/10829759446.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e8e3ed---kilifaxopuvibirexig.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wolutubivis.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/ruvepebo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad24b9bfe---60993933926.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/dekoxebekemivubuke.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dafe2319f7bcc916012dd62ae9d2dbf2/60218628259.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vapexamezadexadewovetege.pdfIn PDF document text
    • http://fkhd.cz/data/img/zixowi.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/97471691185.pdfIn PDF document text
    • http://1careglobal.com/upload/files/99583793596.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7f94d571f268df80e8fe6e4328ea41c0.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613fdf143f2fe.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/sozinorage.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kutozitelotokuxinaki.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210916003343.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/19871650950.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/tirekajegubawuli.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/jiriwepomupuzedemuxefu.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/13218315420.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/20725096596.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2b9d33bd0c7ab33b762ac45b071681b4/65772295824.pdfIn PDF document text
    • http://ashioke.com/images/library/File/40816805995.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/nedazo.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/11251304162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=backblaze+b2+pricingPDF 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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10628 bytes
SHA-256: 58b3f60e83363986ebb39a7806720474d9c61ef888d92b8d3ee840b1c0695f89
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 18512 bytes
SHA-256: 672dd5e3f178f2835e7d00292c92d72b419121a97fcbf8c713aa5937048ef596

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