Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740913a1955733e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 04:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f53ea1b13653b555439af52ff5fc6f48 SHA-1: 7b0d23efa5c3c4daf98f011b860c50e5c7b54968 SHA-256: c740913a1955733e971e8cb3f92b093058769b84d95e35c00511a4291207b13b
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads. The presence of multiple external URIs and link farm indicators suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nhagiatxanh.com/public/default/ckeditor/files/45862015985.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/doxavomuborifox.pdfIn PDF document text
    • http://movediary.com/userfiles/file/kemotogofuronuduxudotibow.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b84a0a984---61380628898.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/78hte8uhto0tinv49erhe8p5ki/46106964126.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/wezadur.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/be982c33e0517dfa6ae58df9d24b7e48/55775786796.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/zipisowetudizumivaziti.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/68820856053.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/11c861637f48b8df3b3f078a956a22cf/denododuton.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/58037367023.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/fokozupa.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/vefijofilenufokesevo.pdfIn PDF document text
    • http://th-hl.com///upload/files/17233834878.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/17782213394.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/wofanawuxapenimuwo.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/80407721339.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zoramijisibavobok.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/fudetene.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/aiikaqc6na2ura7qdlt2ect9cu/juzibupetajafutafigog.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109120520317627.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/mogabotemiwag.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gedugexewigaju.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/fososuxutikaz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/33522200142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=picsart+apk+premium+free+downloadPDF 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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 11060 bytes
SHA-256: 2f6a95e957506017cf386bb660e1ca740c1171621379e76ca407da7f71aeb3e4
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 17520 bytes
SHA-256: 976ba20f0b0a5942f1a13b95c524363c2027639e1e710f3da2118e3d8c7a40cf

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