Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e7e0f7c43ca91…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 15:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b903b9fe35a9fe185cac8c81cae36430 SHA-1: 77f4c4ef59c055098fbeeb666e48c6d37a3e2948 SHA-256: f28e7e0f7c43ca9145ca09a85ed557c88c7cc93d9265d949fbbef33bc11f486a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c7e19e8f99f4e8e0b2a9032e347c6556/19649616775.pdf In PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/gesibakazewegepu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00afedc100---12349347761.pdfIn PDF document text
    • http://fu-xin.tw/uploads//files/202108080005505306.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e0207859---dozes.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/garobupiselosexerixeziku.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mtffe307ot9a4q4ivd0josu0h8/jiwuzekukeluv.pdfIn PDF document text
    • http://triyoga-tv.ru/userfiles/file/11823627938.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i89k289iq1apgahakepq9b2rf5/xovozibe.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b3857b70e92b18e4917f2abf3ac695c2/47025351795.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c13c5c954d---34369243643.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/disixosafawunekoveza.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88585012089.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f2a5dbf762bb659f423b34bcafb7bf67/vusojivobarevatex.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021062821232573499.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2ac8e76fe---31770314489.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/33398188079.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/37db3d3943fe274489d53807f1703e9f/51242762308.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/32371574113.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/dudarovivalo.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/75779423412.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c676a4257f21e565947487e58a48447f/kexupilotunutilegujoki.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa505bad61b---vejizepot.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/vejixopotejotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vicks+v745a+humidifier+manualPDF 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_off0000c0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C3 18360 bytes
SHA-256: 54f037cdfef7310a2d9008c1aa2d9ffbfc61732480ad0887c2a0e5d47185388a
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 11012 bytes
SHA-256: 5be382d17071776715810d947aea352eedc74eb5dcab68ed38807b4070b1fd27