Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf001e0d7069a70…

MALICIOUS

PDF

74.8 KB Created: 2021-06-26 19:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48402cf7c2b4e52d57979ac82620b84f SHA-1: 8e4ca1f53e82859622003446f84e20bfa13bdd00 SHA-256: caf001e0d7069a70338128743f9ea398fde76baa803c21354005442426d68019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://crewmak.ru/uplcv?utm_term=adjective+for+sense+of+smell PDF link annotation
    • http://wojno-stal.pl/pliki/file/fasonipabupamo.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/72606143013.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce59e3f02---zudofisugodavajifofomol.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd522e5f8---50258742485.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/putami.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/kimedotarabinepa.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/66412686399.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3390a385d6bf31c9bc92541b7f1d7738/wologuxurevuzoz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b5766ccf724f339860e021a04d32a3f7/magelegasasub.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2e1352fb---89428126376.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cf848f0e4845fbbcbe29e8ff4def358d/wobufuxidumages.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/fugajenurojunelegalomagu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/37edb96ced50be2d01dcae8e7d069350/83888618825.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/95356de6736ced08e0413b99ece6e49a/mozodufonutewiduforoseke.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5054f7b1eb81389529938c3b10752bd1/92646289405.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739f3c08c25---59953252699.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cb1e5b3d---60455922883.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef18d6163750719ef8dfc824aa7282b8/vodolofat.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33172040075.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210625011443.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210520164419.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/65589602571.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_off0000c0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 16816 bytes
SHA-256: 463e1cd1947050b8f2f1550ea4b9f17482eaee92e249f4efe9dd0e9fa8bef40c
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10652 bytes
SHA-256: efd667f3c0c0c7b82157f6dfd95560fd366de7632b24878d617cb42da307e517