Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf244d935659256f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-31 12:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a0afcf18176bf9dad3e1077aefc5da2 SHA-1: 5e62afca0e64d1b131a4cbc6975b56b949847d04 SHA-256: cf244d935659256f019e27ab4743851f9e7d094ebdf2f3a46d49a8e7fb000471
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate an attempt to disguise its malicious intent as a legitimate document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=antminer+s9se+firmware PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2152bdd1f---dawelosusajitixa.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/58342911325.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/desamadof.pdfIn PDF document text
    • http://polkovnik.su/upload/file/timumapokosozaxigisakowef.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074015e9d53a---foxexatiruwasawaxuza.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/71427975129.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fa3ddb53e8319df47608b267189b8097/25751141348.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16126a3f34b240---1515424933.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210731163622.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106060549555723.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/65325997505.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/jizologe.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/govisowivefonafa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ogi38p1jd8fgbargcq64pu62j3/40327487600.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/3hehdheb4fmtldgs7vgiqgmgfc/38430762982.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/saguwivexobeseniwalomo.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/71344867583.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f2312e132b6706fa99b5c9d13be32b86/87307070364.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/28620241601.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/711f576aa7b53cdca26433baca6021bd/situlosamijoraxomiloleza.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/88531548881.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/aapn5bei5vl3oumajvs7lhnkf5/zebovaxo.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/78682777574.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ldlo2pt6tmqeql5ceqekq33dj5/zuvutezawagorekubiko.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/54437334994.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80faedbe9---sukisusokotivazabakisef.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10444 bytes
SHA-256: 0a11d99c1e6467d4da77e3efc218de24caa57a6040cb743ca51a2772b6219972
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 19844 bytes
SHA-256: 625c2d889809a3588aaab4b3507914988d59e01d511e30d43f993726d6bda433
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1