Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15fad896ed3ace0…

MALICIOUS

PDF

101.4 KB Created: 2021-08-16 13:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d23e8b36dfc31f54cb755c5e60482dbe SHA-1: c635de02c99503ff22a7f57e98ef0c4bb751dc8a SHA-256: d15fad896ed3ace0ed8e17a5674a6f815ed240daf4bab0e3c7340fc79ee73fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t75gfkjdtbtgbf3kl3t9f284ri/jelunukolesivorolenegugu.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021622195293023.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/2649377368.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbc159fb5---gisetek.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/107123e4e40b2cac00d364f37bb5d4f4/31245901800.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/jakiloxibil.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/teromoligedudadegaliki.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/fevivumuketudizozavu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/lokazufidukutuzuxope.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/pifovikebuwive.pdfIn PDF document text
    • http://innotack.com/userfiles/file/81935691494.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc240f2a6d---rinugofosaberoxaxat.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/28013339250.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/16927061050.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/78039600863.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/912856343b6657bb8b44d66284a6aeb8/40478965423.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/655fdad1dc874cb94fc5fb48e100be74/67380196742.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3306828b9333e4de48c4f6770d95f4d1/71609422841.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464b9c2752---voromedumezusipedulik.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4be6857b73047c99d29357854161606c/konitupavadewikuzuvejipe.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/96603057606.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/27d38807bc57c6f55def9b17289fa0b9/pimixebezijijokonipadimul.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1529dd913---zefuredidimelawosogotokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=morale+dela+fable+le+loup+et+l%27agneauPDF 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_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 19004 bytes
SHA-256: b74a04a9866f5b4caacd8dc9da213e58583d8584a92d32ad637b1f2367e23467
font_02_sfnt_off00016e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6A 10680 bytes
SHA-256: e556926130632809a155fccf2922ee13fafe0ceb78aa6049de9d3a717cb117f5

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