Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30f548ec216f2e1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 18:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00d5a69960a41587f6d59885e179c6b1 SHA-1: 36d0832db9df25d217021245abf1772ea6cb55a3 SHA-256: d30f548ec216f2e1644b763abf7a3bb08d223e5bf526fb0c5e9c4472667f1981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to lead users to credential harvesting or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=how+to+download+apk+minecraft PDF link annotation
    • http://melabo.com/upload/files/dejonafizomip.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/nolob.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/bimufejatalixefakowovadi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b895a658347a598de632d613dded4153/72572781278.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/ropegudopoxekeropumor.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430b3dcf7bd---jejebififitum.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/xawofenef.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/73628986583.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614101fd96b37---80065469367.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2d818478---91664150131.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/zoxasexox.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/somujime.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/78485637587.pdfIn PDF document text
    • http://nfc.soo.jp/file/jakijuwugojigamim.pdfIn PDF document text
    • http://levotst.com/uploads/files/92627378989.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/maxamudokadaneridax.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/68013806176.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/mizorawose.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/44fbb387d00bd926bdf1fc51e88fe263/90940926822.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/15406ae2b5ca1805de0eb0cdad3241d3/jitejaxe.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jogazusoxinupedotugew.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/17596781183.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109190017194465.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/bovizebewapesufo.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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 16504 bytes
SHA-256: ac8ca5cbe105916a96438e0fc05b7d633ae4dbb954448465d00ede6e52d9bb19
font_01_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10784 bytes
SHA-256: ace212b4f69d14b2167b14b467dcb8bc3c3278440758408144fa42e589cd1944
font_02_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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