Malicious PDF — malware analysis report

Static analysis result for SHA-256 1363d3980e9b47da…

MALICIOUS

PDF

79.4 KB Created: 2021-08-18 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66b32af95d88bbe0c14e36e4624fa335 SHA-1: 2e0b76bfb2258d9ed15ab2fe80bb771ca35887ee SHA-256: 1363d3980e9b47da901fa468204a6ba5a0730cd2d1126b5d706aa19702b25b6a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=practice+types+of+cellular+transport+worksheet+answer+key PDF link annotation
    • http://alnoorcity.com/userfiles/file/ketobofefoxoz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bef72509b2afebe805f5fbb74e8cde9c/vawew.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8fb952815e0df83886e68d89fa6db045/radalodugigolalafuvujeb.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/16885712403.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d7836199---regosovubupi.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/85744296569.pdfIn PDF document text
    • http://asfalon.com/__files/file/mudopin.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fa96db18---32571687170.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079543ca9a99---9757810508.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/70745068770.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/bowuvibivova.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b8dd981e685ad6e2eea294c3be92adab/wizivabi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4e57cc0---77950000642.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/timarexokesirajipe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ed69acaf---datoxupe.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/22637514043.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161004fffe4fd3---mubefen.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d413f2b87e---vigozew.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/51810332834.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/77633307012.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752262d74a1---79522313530.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/61774033146.pdfIn PDF document text
    • https://peterdegendt.be/file/gujoxosevojalewizinu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/9227688290.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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10972 bytes
SHA-256: 7da7840e1053d5d055dfac06af8900fc8b4e7447f8a48aee74edb0d8b1d053b5
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16760 bytes
SHA-256: 77e8dfd7a8a5e537e8e8e3931cdee3e41bc2f59e2379b46eb1c9a68543da7284