Malicious PDF — malware analysis report

Static analysis result for SHA-256 946e70f909998c96…

MALICIOUS

PDF

93.9 KB Created: 2021-09-01 06:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5479b33d551cd027ad1543de5e4229de SHA-1: edf432c0dd30f6da1099f49020e22a88249b694e SHA-256: 946e70f909998c9622c4efb8dcf47339800ea5583ccb1dc5b4fb61103683f221
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://alakharia.com/public_html/userfiles/file/kunukuzititugav.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/84779318076.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/20882357892.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jikelowewimurivomazafusef.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/97078417810.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/venixesutilepino.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/lorunuzexogitakogadobovo.pdfIn PDF document text
    • http://elitacasa.it/images/file/wosirimatawojokaxurumet.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf94c500b96---66734658702.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/8789469824.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/39b9c75a53f0dfc5cc017e1f191feb2d/22450881004.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/14064846853.pdfIn PDF document text
    • https://shrisaiexport.com/lightspeedweb1/file/vizilojizam.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/92277343072.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/21014013556.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/46172461358.pdfIn PDF document text
    • http://raczcsalad.hu/files/10226684470.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/71956278239.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95b67d682---84856162062.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6dshubnn378cltckdgqeglk5t6/fivazatutegiko.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/xekuzevavizixorugamobes.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff97d103d6---47420573984.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a36380e6907---7268004652.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a04317d3670---33101431210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=songs+without+the+wordsPDF 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_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 10580 bytes
SHA-256: 4d4418e504c0c2b86e24ce64459761f4dd5b49583da148d3b53cc818c84b2aa8
font_01_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 18676 bytes
SHA-256: 9e4c9d830848b4e39a1f4b475cf728847fd89354b8a099e612b9918328ce0adb
font_02_sfnt_off000151da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1