Malicious PDF — malware analysis report

Static analysis result for SHA-256 835da9e99da6d7c3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 09:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c2df5e13210e1ae06ce3a4bb5eaaca SHA-1: 15692a8752f0c9027c50d519aa4ce8dc415b0278 SHA-256: 835da9e99da6d7c3d6a7b0e4682c9bfc46858cecacfd101ee2d6c5cd23454cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to phishing or malware distribution sites. The PDF structure and embedded URLs point towards a phishing attack, likely using a lure related to product searches or delivery, as suggested by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=tissot+pr+100+powermatic+80+manual PDF link annotation
    • http://meble-tk.pl/userfiles/file/57808923204.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b229e1d9---51297171614.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/3862968626.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099a908542b4---19733895916.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gajoluzukapafigop.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ccd38fa---69694956167.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb5155988---49440904615.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/65377826093.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b299b167d07---durifibitegizusexe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e439ab6563f---69925871994.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c52b37fd---88166784655.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/nepizofijaxolinusafegojom.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d3936146ba6807a327e175ce5f3d9b91/12846966044.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6e10af94fa16feae2e5e688c525631e0/25524708794.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e6fcd74dccbb0456b42ce01e439b30ea/vagalem.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qm6nsja39mejebpglacn52hpfb/kilezezososemiluzuvubugo.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/74438878568.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a6a6245093846eb66fd17c243b343db7/fesusosugoporogited.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/67614032862.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7830d3d88---60948224993.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/detokolezomulefemupefe.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a8648d9---85326513680.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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 11068 bytes
SHA-256: f2ca142a75253f8d460c362debb94c112c5799a0a498d4df33746ffe7d0a1609
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 19668 bytes
SHA-256: 636b6a518d845a0153aef3e97ec0b2074eeb512f3c49fab7ce54b06370c73da5

Open this report in the interactive analyzer, or submit your own file for analysis.