Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb38e6b7f519bbfd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 095f3fdd03d2fe27f4f945aafd32cfd6 SHA-1: bf8af4fc09d6cc0a6c5a22fb47714bbdcf87ab01 SHA-256: cb38e6b7f519bbfdc58bf5d50cb87504f869b06c355bea87d3c0ee6c9050e9fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on a compromised WordPress site, with numerous embedded URLs pointing to potentially malicious content. The document body was unreadable, but the presence of these links strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38d263444---10402280210.pdf In PDF document text
    • https://al-wesam.com/userfiles/files/wabef.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/48180240975.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/32766794549.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/34953799219.pdfIn PDF document text
    • http://sooclose.eu/upload/File/wapuxilof.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rewon.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/jedolodas.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/32279951396.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/t1gshvm08dhiv358uuat5h4ohl/sadumufavezifupib.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zowufamoraw.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/wajopotodinefujoje.pdfIn PDF document text
    • http://xhzhengli.com/upload/kisomepawugimifos.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/finagotajane.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/suwafudezu.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/jodikinagevalabunokifeda.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/58908274492.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/73925525609.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/49dtvirgt27p3quu81o66266i0/feketotedusufofufurotob.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/46670983088.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910121234.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210914032600.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jesixidawabex.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lilotufelojiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+take+screenshot+in+note+4PDF 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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 18296 bytes
SHA-256: 7c9556d7cc50f8dddcbc840b0b4b8dd0118e1c5297adf89184a9d8b5c248a239
font_01_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 10528 bytes
SHA-256: ff2a07b4c6bec6659b71422b52ffc85ebbb4284dc6b3bee565fd65377aaa59d8

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