Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c86778a2c584fc…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 00:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6d896e17f8b22e2e8d69c85fac5fcfb SHA-1: 9560c0cf9a62a71fbf31e46e2e6e000da23409eb SHA-256: 34c86778a2c584fc8d1b9b6df66a6fbc246b2c6fab4f63a412e7633b9915eb99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://p87.hu/files/dedokejugel.pdf In PDF document text
    • http://splogservice.ru/content/file/rakaseg.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/digenasajilaxurugo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/leromenusixijewumukubega.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce60b7668---35816401598.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4990d83ae9---satodozanagizaludefiwok.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc015da19---xixodixetuvakane.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/2602732480.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/pixupuw.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gawoboj.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/22143030751.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/23026138836.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7714b18---21039906173.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/vilimilivozilopadunaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724fe6d9c2---pidadedasiruguti.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b8959e2839490853d541fc081f11b20d/kuponuwe.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/90182205197.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba758cfcee4759054bc7c4deaa1c2d03/41980876420.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608447272f02d---jijeku.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5456bf341c---fezefisilijosatugowuxel.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/04d3e00fc5ca3154a85ef6c400af9223/86883705636.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/26a82a12f72786a5d642ab0b4818f803/xopode.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7841d5c85e72d45c616f35744e155fd9/mebofafixipox.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3849b1059644387e98181677e6f57494/gopuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=would+u+rather+questions+gamePDF 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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16884 bytes
SHA-256: ef5733502ffcc406380ef9d04bc5ab79167019c1064be251dab9addd12b282a6
font_01_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 10936 bytes
SHA-256: e2025d843c2be782ea9b7f1da149b94a19152676b03a3dc8db66c9759495e36d

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