Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb13ac46aea4b1e0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 15:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3112e3e847c42c6222bbd0eb9c07b64 SHA-1: de705b2f287b95fcc6914205f52a24e1c1aafd42 SHA-256: cb13ac46aea4b1e0a9888ce239577cc0e7cb37cacb90dbf8a7b4cc8670c48bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on disposable infrastructure, suggesting an attempt to obscure the ultimate destination or evade detection. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://bkm-market.net/userfiles/file/36680712305.pdf In PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/pixuzadexedujelojopi.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/34705202873.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/77049778690.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/68823907245.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/bosasimux.pdfIn PDF document text
    • http://www.depomatrial.com/file/49837024258.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090723534375.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/mokebuxawosefalefo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fc96b7f043b63225b9d5ac43f599dfe0/20055839259.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/nejesutudobu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a99003976c07d7f86eca3b841377d396/kuzubazonogifo.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zujez.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/vodajexinuda.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304dcf9b086---72318464933.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/xasututupu.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/ruloluzulow.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/68684284032.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dasekogezirabo.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090500065773499.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rinujuwofipixopafewujikof.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/25864310354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apa+itu+touchwizPDF 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 17512 bytes
SHA-256: 18af2350b2ec3bde8e49d0bb0e5614f96d5a315fc1b03cf6b7cb7fd8e14cad2b
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10148 bytes
SHA-256: ae7066eb8dcdd8fc33e82a3b6626d4e80bdcf562c7ab2486881500fc47c56440

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