Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fda4f1395d984cf…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55a7187e45061ad6267c6806ad5665bf SHA-1: 7a94985e4643387ebbec27e7e4b5f13fc63a76af SHA-256: 7fda4f1395d984cf6ffcb17903867efbda56b6e61e36005a5900a36d3d3b2db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is likely a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=crear+tonos+para+android+online PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/059406673f3844cb5164e3a840e3014e/74281774550.pdfIn PDF document text
    • https://fond.ru/userfiles/file/53938385919.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/losilibabozedafekivefu.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/xutisezivonasilotenilokam.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/mopevutumebi.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bujolerapopekade.pdfIn PDF document text
    • https://successalpha.team/upload/files/nobubif.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/81586403143.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/wugep.pdfIn PDF document text
    • http://klinok-saintp.ru/files/24528445508.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/45704381261469cd232acf.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd190cf8b5---lolepuvomubofewabun.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d91074a15---pixufidosuka.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/5103517737.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/41650215014.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xofej.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/ripaxunexafo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/paseru.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/9719018441.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/66673448947.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wiwubapubulojazagowig.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/xisirawukuxinoxiw.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/94056157397.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109240053592272.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/62531661302.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vosenafekamezejuv.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_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10416 bytes
SHA-256: 0f2cca6f0c99e29d88c550cc3de4148f1b428e4e15750d651e64f987a67fe28d
font_02_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 18240 bytes
SHA-256: 19bd64a70dd6204c4f92f685fb51140875c1e9f7445598132363253125cf6f73