Malicious PDF — malware analysis report

Static analysis result for SHA-256 321841dda8229d29…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 12:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0af1a6e38dc08e986b034d6366f34515 SHA-1: 73468e2ac36047511bed6531d2c880e7ae41e011 SHA-256: 321841dda8229d29182c4d796507011e9b703c357464fb3b4038dae92af0712c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bangtaisay.com/uploads/userfiles/file/lejediloge.pdf In PDF document text
    • http://rcp-ranstadt.us/files/zinuxi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/18267826842.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mirinobegolovax.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/26971850099.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/50578963654.pdfIn PDF document text
    • https://phnews.ro/files/file/xofiluj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613447b08c83a---jazizawokowan.pdfIn PDF document text
    • https://emenu.hu/editor_up/98371280048.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wijosewuzenodalumulixavu.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/vegarupabowonuxukoba.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912071221.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/timetuxutime.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9d1d6b92---66163412439.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/xiwatovex.pdfIn PDF document text
    • https://maisonforville.be/documents/file/nelomigof.pdfIn PDF document text
    • http://darec.sk/files/files/leviberiji.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/21255912414.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfb06ea59---24282883060.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b54c0296---74626092040.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/6588355870.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/tabutajerexonazad.pdfIn PDF document text
    • https://cmoretv.com/userfiles/radapajunesonewowuzowipug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tamilo+serial+list+vijay+tvPDF 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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 18500 bytes
SHA-256: 42f5d9cc55a60405e64d33ff6e30ad981cbacd956b47411e3822a1d77db6c190
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10436 bytes
SHA-256: 9d1ab833cdb020ca19938c2acdfdbf9fa2e387d6c15e0135eadb4e1da2a0d464

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