Malicious PDF — malware analysis report

Static analysis result for SHA-256 f403bb2c3129e3be…

MALICIOUS

PDF

80.2 KB Created: 2021-07-02 10:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36e46dc9e02678a8749ed076dc8760b3 SHA-1: 7c5e7b5287ee997b151e0ac4092c19d2ab7b60d5 SHA-256: f403bb2c3129e3bec31a716e1d4545a9a9b0246ddf3035919dea2218c8fa45a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc22e88476---58515076013.pdf In PDF document text
    • http://balogmihaly.hu/UserFiles/file/galisojotonurir.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/puzevizedatubul.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/41738798890.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958f9a68fe---xogebarujawijofepefu.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/tijaxegakarunu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc97c6d599---37322538824.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a97e02ac0---87293534891.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qakerhok2qd436u09mu0kfbug7/sezazutaseparavuvo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/42881871386.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/7236796412.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jesegaxavagokavixun.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160896e03519db---nozirojinotenij.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080831415b6b---42638614847.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa2d142c270b5dd48fb900f6bf36dfb8/pefilozipalitebinesef.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/60f4f59eb88ce6d73b49dd70d293517d/20921740688.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/21599413438.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f371408484867538fc15000f2146f46f/21769610628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5541282f---41687773980.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e1d5285e8219eae1a8429fcd4d2f020c/50745530846.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dup3355r9d3fc851angli7131h/38838892327.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/kevisokola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+exposition+of+the+story+the+tell+tale+heartPDF 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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 10664 bytes
SHA-256: 1d64376b9d863a974364e760309cccac58354cb334b7741c962d4e3efc5f7a28
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 17232 bytes
SHA-256: 9e61d153070825add9571eebb6cf007dd33e040b6f727db9d308349ba9e904ab

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