Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8471c5942382e5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 19:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d08d3a8016ef87b259aa64e3e374f4 SHA-1: fcd5bb550e15095ae50e8adfdc848e609053b37f SHA-256: de8471c5942382e5abd53d11e2a71d12c2b610540fb93d83a9ec5729a0057ef7
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of JavaScript indicates an intent to perform actions beyond static document display.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://people11people.com/uploads/File/bixowufarujawawukipe.pdf In PDF document text
    • https://speculatio.in/ci/userfiles/files/kugowosowitidupaxalab.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/27510752741.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/46795706408.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/towexawiruxazejam.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/kuburerajutifas.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/pofoguredesasuz.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jinerujizon.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47505471757.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kotixusesotawun.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6d0acb1f---worugugidikelusikidanir.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/91269111915.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wetunebijufibewizow.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/fatikineduwejawasanaf.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/roxitiveleviduzojurir.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910081145.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d80c15571---24762684919.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/kadesuvozavawabisosamav.pdfIn PDF document text
    • http://synhbio.com/upload/files/2993526967.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614238d03ed99---jetusisipepuki.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/lizivosavanud.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/jatopunobodonalazamijejak.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/duralubovugotigubukeni.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/66679483808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=my+hero+one%27s+justice+2+apkPDF 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 18000 bytes
SHA-256: 104457a176bd342e46f3f70c4609b05789b8c2d6d3a10253a32a841a23d9e920
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 11008 bytes
SHA-256: fef269b2059fff1b6a69ee370a6063d525daa3c663e6b6f3fcab68672ce7d810