Malicious PDF — malware analysis report

Static analysis result for SHA-256 b380876cc35af49e…

MALICIOUS

PDF

74.1 KB Created: 2021-08-30 04:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86cab504111151865f150e094ebbaa15 SHA-1: c08f1a1d6071bd19f36e8364f495969ceea491e3 SHA-256: b380876cc35af49eba9fd4ee2982cb7819f468fa1d284b942aa6d7db639050ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://jahanchart.ir/data/files/file/11589486053.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8df05678885c91c0fcfc4bf8c241b8bd/luzuxorebini.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/13752922711.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/68999714777.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/53696730623.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/01bef9d64a0d54e617289b30058f02fa/32939724238.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076341db70ca---mukumilojemusivat.pdfIn PDF document text
    • https://curvy.tw/upload/files/58427363001.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c5aa8e7643f63f3ea7e57f2b178664d/44300568608.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a1305ebb90ca8b5f511e952ac188449b/dadasomesekege.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1891096dbc---50191028138.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7544418392267407a7d8d57413b8207d/18242019962.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/2956291269.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb8f87fa1---baputaluvolej.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40443636911.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/vujudefaxosupegol.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ffdce72d8---totetopuwatar.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/nutokedaguwomisedu.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/66590637067.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/75282267983.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/47791827413.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/ruwopakedox.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dovobuwobifugaf.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gekikobudebegopibowe.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/84330379554.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/86528927923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=i+had+cataract+surgery+now+i+see+bubble+in+my+visionPDF 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_off0000bebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 15952 bytes
SHA-256: 9706a81decadf258b8a38577471452c2df405e6aecaa0f1464a2b60786df2ede
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 11276 bytes
SHA-256: 939a0d0ea579ba85be5c275c7c1ebc440acdd9ce1a17400560a6a78e8f371f94

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