Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaff802f5882bfa…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 05:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 106ea5be32403e0b8aa62fc5550e2a34 SHA-1: 5b72b6b6bab7456bf83db9bc05d4519fbdbdb9ad SHA-256: daaff802f5882bfad1f5ef9f0ff8284cc8b6dd7fc255c8acd0a6e384d68ae702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bulgankhangai.mn/userfiles/files/movoxofawemenovupe.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877c02c41a9---2713798956.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/zabikupofufinixamotukalut.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/03cfeec4e2011a2a8702b2527d3fd037/5898671371.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/13438506615.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6c3902dc---74270593079.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/47bdfc93fa0e16beb880576c44696219/susurugo.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/87443210600.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/74510983278.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xasoba.pdfIn PDF document text
    • https://epiphanych.com/images/file/77424782434.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/69789504365.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/45447966449.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/98833974201.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa649ee2d---59892168289.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/91644278541.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7c8857e83c5d7383c025176a510ad907/53738284524.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/kesubokur.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nexofuwofizi.pdfIn PDF document text
    • http://jar-ted.pl/file/dilob.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sg504l3oni4m6lcan9dav4tsp8/zakog.pdfIn PDF document text
    • http://full814.com/upload/files/75640723008.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/46561458304.pdfIn PDF document text
    • https://yellowstonewildlife.com/dinumezoxozazijepepeg.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070445360e61---neragefakabefusux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=yummy+asian+hoursPDF link annotation
    • 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_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10292 bytes
SHA-256: be280a4be9e0436f51c6d724a4fa85ae30bb55cc976151ab729a8d82fa7dc401
font_02_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 16752 bytes
SHA-256: 2baadc3174ac512c662d7467e91e709571154480fabc1b45d3392a1b608a6fe5

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