Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f607598de6b5395…

MALICIOUS

PDF

97.5 KB Created: 2021-07-05 03:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 670d77be0f53c8f16500d05d3c1e1462 SHA-1: 586e2cbb96d79adf95c3e5ae84cad8602068a1cb SHA-256: 1f607598de6b53958af12149a8be9194ee974bc4138ee80ae4b9881cd338dbc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of embedded URLs and the nature of the heuristics suggest this file is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bc90870a336712a2642871b26ee7e283/81698318593.pdf In PDF document text
    • https://yellowstonewildlife.com/zipozufiribamezazelop.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b5512c450f9---31654032745.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/8116676807.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/21682546287.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/81692759015.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095c694ce90d---mabazijumewi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c39c79ca6eb7d2acec474c7d6963a572/37830931522.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/191073130be34e50ac8a23d63ad439fc/87371474928.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/7628259172.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b63981df---niragovufagixug.pdfIn PDF document text
    • http://orthopediedelft.eu/files/61941851498.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/tosaforatiw.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wojiwujukikopare.pdfIn PDF document text
    • https://etadelloro.it/images/file/jepiwuxiduvunul.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/81199380684.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84b77ba4a---dedurasojuvatiketanutel.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/7814857280.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/12465621fa803c7e54939d4f02e1d123/66890744966.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d20fd9882---96305280202.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/p12lc71cgfv8kjqkc0aughjjs0/pebixosotujanazelo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/28ddc4efe3faed239f6fddf573dbfab5/88140367971.pdfIn PDF document text
    • http://sns.hu/_user/file/rewemala.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210521123041186.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19156ab4---56876833015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fsh+and+lshPDF 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_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 9780 bytes
SHA-256: 9d03c94b57370cac61d0be452e5a9c0bcf66066a86cdd5d3ac059adc3268b93e
font_02_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 18448 bytes
SHA-256: c61843717c8d7d1096b03ed76362b23ab3558deea698e2e2cf5c5ddf5224bd9a