Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0cb9423bd1e3ff…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 04:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1d624a138e28d8a71c6b57851c3c876 SHA-1: b1b34f814e71b7572b971d819f67dd49558b4577 SHA-256: 9b0cb9423bd1e3ff14516041b0d912898c648c4ee6fe7f3761faf0d657106932
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm that points to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests the document is likely used for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) further supports its role in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://reelproductionshd.com/userfiles/file/jeritadizawowavagibapap.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/44849388100.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/91856097038.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/70827885586.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/mogelulanufikulomafataf.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/sedoxafifelaxuv.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/danojaxikininivafezimuwi.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/dobibetulumim.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vunon.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/jikimuw.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/68605301721.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/62147368482.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/3949787294.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6c76d0e89cebd4b1527800e38ab10b8/numovoromijefok.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18091149824.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/51106879042.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/35480593938.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7f12a89e---64799762627.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132979c8b8bd---11636795807.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/86127286943.pdfIn PDF document text
    • http://actinq.nl/upload/file/risavo.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/88507922358.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/bujipe.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/49024502138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cod+tool+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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 19520 bytes
SHA-256: f4e045387ea71bb965c9ac352bb31e0739e79dc85d7ddfdd954b6a5f4b50fb44
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 9912 bytes
SHA-256: f802bf45bbe2427e641abe7213ef176682541c9ffce4815e4064a7e9a3098d97