Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3b76f259f973a4…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 22:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4096d18d155a2d1cbd1af2bd6247154c SHA-1: a33d6826bd069727101fb4b8b225178c8b68a8d3 SHA-256: 0a3b76f259f973a4c4e64041e40f5d26fcff643745b03f211b2b504f0641140a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=instructions+on+how+to+use+an+easy+bake+oven PDF link annotation
    • https://serwisnawigacji.pl/userfiles/file/6119837746.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e634df0b2b---14393147202.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/90958591322.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c332608d412bdfd8deb85dfc9ebca7fd/60628859619.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf361a6a68f---30664906768.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/kepurifen.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/91913263576.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6faf284ce---54766680362.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vusugizev.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210619092155_m12mg3.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608376489b045---94787417035.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a7426cb3---pizoduwobexix.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807c85ab8cc---16633372902.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f77233c80---janivoruluxezimaxul.pdfIn PDF document text
    • http://thedreams.cz/files/dodirotejuxegizovu.pdfIn PDF document text
    • http://fitviewer.de/files/file/fokazarelovolo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3c4730b---32155966240.pdfIn PDF document text
    • https://bfull.ru/uploads/files/negekozuxafiwemodurotel.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0760488ab1---fesikolofojurupuzepularax.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/76886394600.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/40045270552.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/72524290911.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/xowefa.pdfIn PDF document text
    • 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 17380 bytes
SHA-256: 27a177e3fb076a9cd7af82147c4399c07f8ff4e3e8a25e7ae94d912816484209
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 10828 bytes
SHA-256: 5a47b00f9c3294a5dca44e65e0df77c41031f7ac86ae326b310bba92723c9c32

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