Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e36bc13fe05d035…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e725c7430c459998e7a973e58ac5f599 SHA-1: e0b87b825e0703f4d7782b66289f698f56bf843f SHA-256: 8e36bc13fe05d035185230362d99d60d68af7bd35cdb896476972ff860f556d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially harmful content, such as phishing pages or malware downloads. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=logo+design+love+2nd+edition+pdf+free+download PDF link annotation
    • http://surtek.biz/image/files/20150208_014105.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6c21ecca---vufanavovaje.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/fcb7bfb7bb30a9c4d10488b9471dba41/95923322112.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/biruxilafefikusulipelakop.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/39000124217.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/muluxojikaviwex.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/99915695533.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/zagalumigu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad0892f17---87235295829.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e405977e59---18933077720.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bedam.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a04b9241---31502536363.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/37857039464.pdfIn PDF document text
    • http://lobi.md/userfiles/file/62943590140.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kazewiba.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/fbc69b8a822afb67f4118e819edf2a36/80022639385.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/40131461098.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/32237289269.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/is3oaksp1u3m61tt8u6qaquar6/12811113396.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d159b68b---12471027131.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1072b7e2e06e4b4cfc5f43ada055b999/30829363333.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/befexurosuvikubadiw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/safadixa.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_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 16036 bytes
SHA-256: dd55d95a4e8176df6369a54e2481e95fb5602fdf8ef45b4852be5466199b0c76
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 10900 bytes
SHA-256: c9965b05a3b7591dfeff85684714cb6b5902e5751ece6834b1b2df9b174b85bf

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