Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff29a94fec11b11c…

MALICIOUS

PDF

98.0 KB Created: 2021-07-16 12:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31cd7cdc55dbec97d3db54d73f66a99e SHA-1: 3191f5af116b273b3649ed8a7953feb597426fd0 SHA-256: ff29a94fec11b11c4d5a0349b71de549012fe948da7b57c3453ae637b23424e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef7139082---keruk.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ha4ha5mpv1ij49rto6omps3vka/gejip.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca708bb8b9---logazewaropafu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d707f7327c6---pivowudelekoziwubevu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/8ta08kll3n9amps87gekcm9k39/72575144401.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83f2e16d7---75483436586.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lefekadagagugelexabude.pdfIn PDF document text
    • http://cga82.com/admin/File/73230490339.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/medurufazigaz.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vevuwajak.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18b47f847---sodekasosadafikip.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/23jnaj9vc67go8205sf2mkq77f/tovumorazo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff83b193c2---78566799395.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2655fbf87a35a04ef93175b2189c6d99/juvikag.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28156108753.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kuzeliluparuvuv.pdfIn PDF document text
    • http://chayka-svg.ru/files/21024259793.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/89843956262.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14e1d89e8---59792410284.pdfIn PDF document text
    • https://attack.lt/images/files/jupajapes.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1a68a636fe7f8180deaf429e0b17ca4e/dadosimezomadejamisuwa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9005668a9bfadd7e133efc41bb961ea8/tunirizugurak.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067b73656b---12820396421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pretty+little+liars+the+perfectionistPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10692 bytes
SHA-256: e1e1cc77dedaec8a8de705c6b031843a990b0af29ef839284b8e41302407becd
font_02_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 17336 bytes
SHA-256: 4ef0900767c327573ebc2f14b3d510cff8048e0bf7530fdd770f9e4bef1701e4
font_03_sfnt_off000163df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DF 16368 bytes
SHA-256: 49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f