Malicious PDF — malware analysis report

Static analysis result for SHA-256 1907a1620c37fd39…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 12:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ee59d6e4457e166aa2b76e6b0e9d0c0 SHA-1: db5337dcd126d5d09367e3006c617fdbca9329a8 SHA-256: 1907a1620c37fd39156c3b1d7e0e6d9379782e0f76e917c4028e11d1fcb0fcc1
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 domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=the+original+rules+of+basketball PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a16568e1e5371b2ba5785f1708f56706/wopifaduranejupigovoxep.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/tidubi.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jekaku.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/13905983877.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/bonoradoburufosode.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef26b11609---komebetedomaxurilodegu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bdd5321a6e621300b8880ff8437d7f9/mesipe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/914c1c0dff62d7a1d929a0cbad2d93a4/rewalixufesak.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11664359140.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/mekojuzuwovilodiravufam.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d3va1a4qqffneecag2p2eh3mvv/66110902757.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/1349709975.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/7337508231.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/36386841081.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/bimalejelewufunep.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce653171a---94391988038.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/70887277011.pdfIn PDF document text
    • https://limsurdua.com/contents/files/46248562521.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/41964088744.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/lupaxedamotuv.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/21893578489.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_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 10788 bytes
SHA-256: 6524cb07a510ea2ead4619d16df2cb7d21be66cf11bdd4da82d4e72c1ab458e0
font_01_sfnt_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 16872 bytes
SHA-256: 6c1a7abcfcf03e7372a47354b7a9fabd0ba5c2d1cbe900878ceac2642acd5fcf
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1