Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f59ab4338003cc2…

MALICIOUS

PDF

147.1 KB Created: 2021-07-05 04:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4042061e18d882c42c8f8ad90340c058 SHA-1: 436e26d8f2c11e9e26852258e1f63a1d1c730355 SHA-256: 4f59ab4338003cc2dc37fc451f3bad16da244aeef11945dae19899ddfd78119f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9vgt8dvmgbnua0bql9nt9u246u/96381889064.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c4fd6b12e---bogilofurafelepusoroxe.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/72599026144.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160874d6f4cb9b---kaduwi.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/24933931150.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a0710d439---25540155114.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/zogobojiwadudiwareduxe.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/0mdqatn834sbahi4reoo8meom8/82301676084.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/61203921142.pdfIn PDF document text
    • http://france-ex.com/69530450460.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/67777688862.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/11222647756.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e22ffea5dfc---44876762557.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sanokufukavisemoxitoka.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/3697117828.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905abdab93e---50940043267.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lq37j7egasj0t4m4b3tef7dbng/87286978364.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2f62405a2a775390bf4b08ea44ecd886/noxegu.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/10152060064.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zonimosajitabedexafiruzas.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/tbu0jphlpoo2gp00vs09a8ncej/82945279445.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c5860eea3c9f8a2814863d014b80a576/96701761400.pdfIn PDF document text
    • https://t2sc.me/userfiles/35168119350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=protection+warrior+gearPDF 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_off0001e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3B5 10276 bytes
SHA-256: 91b0a73c74e4b94d74741c986c0fea7727bf6c5a5457772c7a1b7689e387871c
font_01_sfnt_off0001fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB08 16692 bytes
SHA-256: bb9ea0e5cd7674892ae3ca5251df1ec97395448fca80d936c2bcb025567dcf51
font_02_sfnt_off000226a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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