Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9b354ec15c016f…

MALICIOUS

PDF

81.5 KB Created: 2021-08-18 17:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a0287623563afa035dd5431499279dac SHA-1: 696623cbadd1307ebcdaca745764df915e6714fa SHA-256: 4d9b354ec15c016f6794098ef1d63520670f1eb4346fd5d6e80092c628df926b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114e597e9ac1---jibojabaxojap.pdf In PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/21748001439.pdfIn PDF document text
    • http://recviem.ru/img/upload/wotijebenila.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/82781076481.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/57165814532.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab59019b2d---3036576693.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/27084023793.pdfIn PDF document text
    • http://pneusmarene.it/images/file/bawisuwijuluwilo.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/65349582176.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kegovajabasifireva.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f34863fa771e6e7c9810fdbb43c8e93a/tibividulesizof.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5aec0e57---xubesufosebimifu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/74411495890.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/47469023052.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/tuwapetowefa.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/molupeneran.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/pigapumilurujopozupudib.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/guvezubumitorajunazagon.pdfIn PDF document text
    • https://kartplast.com/resimler/files/89975295028.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/96263828801.pdfIn PDF document text
    • http://446888.top/userfiles/file/vedelej.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/9397772404.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/noroworafajax.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/dajesasonuganunod.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/mulakigilemufojubevam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=petty+cash+log+book+excelPDF 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_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 10664 bytes
SHA-256: 248c12303d3f153e90cea357ad7080c88b60a82930e52da6f7dc75d289874f86
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 16028 bytes
SHA-256: a8cc2d1d1fb7bc64abc2d6a45c1a0c8e79f092293a0fca4929c019ece18a5bfb

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