Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e52ab926893878…

MALICIOUS

PDF

80.9 KB Created: 2021-07-31 11:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b12d6731779eaa5b341b89e971fa63da SHA-1: d0d10c06ce5424d4f66ee95a4998156e065f0ea1 SHA-256: 97e52ab92689387815be1203105c24dba62dea8754fed9bb2d7da00159d8f25e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. These elements suggest the PDF is used to redirect users to potentially malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://arablift.net/userfiles/file/zukokojogod.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad9794ee---77042281811.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d686ddb421e---75470797097.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f110fc7f60f32061cb8197b41ca54f8/21624213528.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27005369915.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/i6etahrmbc3fmvch68jssehe11/50035334344.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/79932957009.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sobufomogazowugesafu.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/83102971692.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wefazonaf.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/75961296986.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/62895938896.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/bpmob485v4s3ar0o8bekrk4226/pilifugezupat.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/ralogev.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/63145476651.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/48170993551.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b4102bab9---19808672372.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f57aa62f6---42502247054.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098504030692---80669214994.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zenefufeki.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/af8e8bafee34c72942b36a8ceb4243d7/50718292547.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/32532597700.pdfIn PDF document text
    • http://muszempilla.com/files/file/86290554962.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9b212e972---zejidirisimedogaloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ozark+trail+junior+dome+tent+instructionsPDF 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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16972 bytes
SHA-256: 979f7de315458741159ab1e781b7b9ecb88742a5ed234db0a8ab5607c8bccb88
font_02_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 10936 bytes
SHA-256: b8eb8432e7f4689352694cb67399917c216438dedfc389e0dbd467710e62c64a

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