Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb453b8711a0ff…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 12:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1b4af1acf28d8a9d1a2acec9004b3fd SHA-1: 7044dcdcd9e225450fef1f8e2c9465f9dbcdfd3b SHA-256: f5fb453b8711a0ff786fe9723ca47b431f1779da0d3140fae933e7a462a9de60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The embedded JavaScript likely facilitates redirection or further malicious actions, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://ac-kenigsberg.ru/files/file/xuribif.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369afd26c32---sikegaz.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5f98cecfedd5503f296e13e913950c92/wodobe.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/17149643835.pdfIn PDF document text
    • http://kunbot.com/upload/files/84367095520.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/29754539387.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/jeborenoxuzewexaduj.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/lowozewewiva.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/91145229291.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/luxezit.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/dedinojijux.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/jikijajugodozevis.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cf8814a21f82fb8b4b79f0d25d06367f/sakel.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/givip.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dalaxoxa.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tejobanilo.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/dorusefe.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/93355496697.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fface065410c971d444f11d32b7aeab9/38944193746.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/17734722606.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/riwojapirenofajumu.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630868298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nomadland+online+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 21028 bytes
SHA-256: b88df17f9bc20ea2f4241d2bebdcc7c138948237b84d9f4935fc79eed35fe90d
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10124 bytes
SHA-256: 9cc4a197df3e07d7f5639f4a52ea55d831aca089006eeb440c8a00beac44a88e
font_02_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000130a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 17184 bytes
SHA-256: 559fd6b39bd44d48dd9c3a796352e20e0c8672afb2bc02c5a3f1a6a9607c7741

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