Malicious PDF — malware analysis report

Static analysis result for SHA-256 b694ba8023639dc0…

MALICIOUS

PDF

125.1 KB Created: 2021-09-04 20:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a98b69456500410bdd1357deec7a4ba SHA-1: 55db8484e162b3fd7b04d5fc84b5c4800cbee786 SHA-256: b694ba8023639dc03d9ad5e96897eeeb0eec8717a23134ec2a69e4e04ffe588a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dm288.rs/slicice/file/vowaburegibegusujixinakix.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe573b20---85687299322.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/63660404428.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/6s1ggftct9gj9ct0nbjvc3heto/94284244387.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc981cac91---48762795695.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608010dc0d69b---tinukifusim.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c2f0d4d1caf56231380e8055f7b1709c/topudo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pmhkpihi7a5et928b9soql9ol2/nixuwuganafapa.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/032e4da56ab261dc3284881ba4177f76/kuralogumebixanukike.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c1b678946ae154aab8d5800ef86193ed/40967625860.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gv3htssht44a2g0ofcsem2qlqv/zebuxijiguxevevuzepa.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6e73f58d11944fbfa434771bdd577a54/61992314331.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/wodaxaw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/97e327f08d1418cd78066fe0ff6904bd/62411275805.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a7633ce241b2186bb0abf48993978d92/27215866228.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842c7b20f1a---14699649493.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/waduzelexowegejokebo.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pogitelirelap.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/97452325260.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d8b1ab8f---55849263977.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/pofusajeravidukotifim.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zagabu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5433846d6bc5f556c3326ad8e1ad5f4c/48538176619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=navarathri+pooja+tamil+pdfPDF 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_off0001807e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1807E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19895 10532 bytes
SHA-256: cdd5a358d7c376d48622d238258facc061cf16fdd6a3b81387e71177f36a246f
font_02_sfnt_off0001b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B07E 20792 bytes
SHA-256: c8f8a5fa47c4271e5412e62bc8823e8d047e35baac864db40718fc59c3d74545

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