Malicious PDF — malware analysis report

Static analysis result for SHA-256 6307ee1cbe5259a2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 19:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e3851b29914c647d8765d9c082aad32 SHA-1: b82691d22d07a980d257dc4bc23ffdc5b38fdebb SHA-256: 6307ee1cbe5259a22451ff52f9af4648da784be647447280d8016b1a755d558c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f638f572e0---85432774600.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/46527353646.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3cq6f9tmtphp22vodjh4no5h25/40231059948.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/91558275.pdfIn PDF document text
    • https://limsurempat.com/contents/files/figukafazoxefubivevobov.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/92106375629.pdfIn PDF document text
    • https://almavilag.hu/files/files/56112490778.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/33642792263.pdfPDF link annotation
    • http://diegogenna.it/userfiles/files/84599786924.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/43786721170.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/68273653926.pdfIn PDF document text
    • https://ikansambel.com/contents/files/bolifoj.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021911200225126.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/49307583020.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/80234776943.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0cdb659c6---navejojaraxi.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/6739334239.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tikuxuzogilifarepiv.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/79359502477.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kurabupisi.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/masoxaw.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/32962751720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chhota+bheem+the+hero+mod+apk+downloadPDF link annotation
    • https://easyown.ddproperty.com/datas/files/86063087831.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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 10744 bytes
SHA-256: 904a4de7ad1817214b998ca9c9ef55960a13787c2ab8063b0da0635cd5be4250
font_01_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 16292 bytes
SHA-256: a4a1942c72521f72e63fd17de7bd60631978f7a93e3427018e8f07b37f8d6cb0