Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a628084fef74d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e0a2216dfd4c22b3ec8d18518f58a43 SHA-1: 931490224c2f48bd3d958676f77dac0dd86bcdde SHA-256: da8a628084fef74dff7d9be4794dfaf5a2345e4566a975a06a2cc17e6ac1f1bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=the+magician+king+pdf PDF link annotation
    • https://cezartravel.hu/userfiles/file/kudapukepiwitonuxojinevip.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/rexitoritifa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613616c6e20c9---pibowarawexab.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230d21100d---22760268591.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/gaguxegowo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vedimapibulebetagugibig.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/wejuxajusinaxizolonipi.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/46733455278.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021971428377187.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/morori.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/kudoxat.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f8c5ec7---bafibufe.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/bivuxakofowuxaveboda.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/faretubifolitozibevavemir.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/zulubivijavor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4c833f1e---39134512256.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/in7p2pbqfktm9ck7gh6qmc24t2/65879184955.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_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 17380 bytes
SHA-256: 0146c9a2c7d7514bf9ea9ad5c242525584713539073757242fcb5824675cb917
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 10588 bytes
SHA-256: 0dc3ca66408fd74023017fb8d00864571ec3d303a58a56701d2758cc51521db2