Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f86b90a5aacbdd…

MALICIOUS

PDF

91.7 KB Created: 2021-09-19 20:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 39a313ef1dd25bce6a7e79b6923c30a2 SHA-1: 56b08e0d6a24a6ca356f2e45010fdc574d78afd8 SHA-256: 43f86b90a5aacbdd70a1e89a8e9a2513a430b7f0fcbf6992216a4f380307f7aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=twilight+watch+online PDF link annotation
    • http://skkouty.cz/ckfinder/userfiles/files/65399562226.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/69549030036.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/16813941550.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/32640792379.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/zaxepivifuf.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/101307061263.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/1557225030.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/vigulebaviwakewagotuli.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/10265860593.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/59140782544.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zavumejoxolano.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/68228702743.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e308aae0---bikabarokerunom.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9ce33d54fb9c1c52162c39cc343a9355/rexapimolujabiza.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/77198817325.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedb699c79---zewogulevijubutudo.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sajew.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/xinuwapebi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/95816801438.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/mifeli.pdfIn PDF document text
    • http://tzsunup.com/upload/vevunoginevojomedimideloz.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/85980031196.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/40682169945.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/57592517752.pdfIn PDF document text
    • https://salwangurugram.com/files/rimetalunumazawop.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/24410611997.pdfIn PDF document text
    • 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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10292 bytes
SHA-256: acc963c936485aaf44fda66827178619e6145e7e23a6c4af74257a27a05ec685
font_02_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 17580 bytes
SHA-256: d5236f52cdaed2e563ec3ab506d5ec5a57fdeededa854d959f94703a792a936e

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