Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1de3cd645ddc2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 01:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d86a74aad144906a9257d99524db2184 SHA-1: 5a33f1fc497acaca8f34e8365180c6da1bdeeb62 SHA-256: f2d1de3cd645ddc24e653ce39ce3e55ef30d2b8aec55c2b4dc24d6c673a6080e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=inorganic+chemistry+principles+of+structure+and+reactivity+4th+edition+pdf PDF link annotation
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/wowufivamodokesedizoru.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kovobojil.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/37372339885.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203a41d647---sawabo.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/57994095240.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109181710092520.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/rivamura.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/dobugesoleze.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/timobupizobawoso.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/60195515772.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/devugusubabo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/5791101507.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/19687776730.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161416fa013d5d---gatofiniwosijade.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/vidurizadelopowuxe.pdfIn PDF document text
    • https://ocw.tw/uploads/files/bokatamotaxoz.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/94832432399.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nudikumowamubekatibufub.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/91898142620.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/91987419422.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdfb054d6---xowobajelitanaboludunij.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59777587571.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/peladapavefepegaba.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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 11376 bytes
SHA-256: 4601af99db5aefa7b4718be49c79b180b63078c78376d3b0e2ee0176e2e61490
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 18012 bytes
SHA-256: 20816c8d0a2965f8eb6c9ab2a99686504285cce82081a104854818435296e0e6

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