Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf09abfe563407a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 23:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f3543a266c0341732e89316b0323eb2 SHA-1: 6af82b78c77a2853b85e727e9c08a26ad44aef53 SHA-256: aaf09abfe563407aeb11419b58048b0aa126263ef6872aaa84e150712d4d854c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6f75eece2763b3615855dbd097ee261f/9272535047.pdf In PDF document text
    • http://investgeorgia.ge/userfiles/file/japuramuguvep.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/47723498627.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/58114490116.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/wesenadoru.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ag9eqiva04ekj1mt79v58gc4m7/94944958636.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/pamego.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39dea91d78---zazaxakefonomolobiratuz.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/37765676501.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16242029081071.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050813594720.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pusogodakajegijuro.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kugabolosigirukik.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/gibolavubaditaxif.pdfIn PDF document text
    • http://119pump.net/d/files/86749964585.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe4ebd6da---sofisolopixusiliw.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/4383915043.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71af08701---55244625500.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/56552177263.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/dufedewetinatig.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/68782395626.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dd9c68789---93389035701.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/19152643884.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/lowusuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+flash+ebook+to+pdf+onlinePDF 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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 10924 bytes
SHA-256: a67b0b96c36948779521e3017dad6db6a93ccda01011752d1184632b15d6ddc8
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 18024 bytes
SHA-256: 8db7cfdb9c3141ad630775241d13340213bfcf0643f0598f1151847ace6a0c65

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