Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb4534950a63e02…

MALICIOUS

PDF

148.2 KB Created: 2021-08-09 04:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba2170a02ed8690fcf4931ba303bc623 SHA-1: 960bb66cd5c7dd6e6f7ff2d0375219776bbbab71 SHA-256: 9cb4534950a63e025ddf1a9e7f861e8aede7811dc62c56788a61f3365a70a62e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of external URI links and link farm indicators suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/a1887e52912ac490e60a90976829a88a/dimakewolakazupidewodan.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uofu7810moio4skrekrf841ce5/jawivutonajir.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cfff65d1ec6b2804fcb72463e16e4a94/senarag.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b77e8b801---7584080015.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49f1196b2---wumigujos.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca955e3f93---8348153713.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eb3dc7de9d9fa95676bf43dccd4eb7c7/tagoxumopifoza.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/91767df6c2d2c8b7c5553d6ae109aa2e/82556257207.pdfIn PDF document text
    • http://clingac.com/d/files/fitofokupox.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/89606543998.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607059bd28f4a---dizemevi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/sagevexibunaxobosu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tpqi3av337apet5ud89b6funf2/winisoke.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/bujudevuzoxafanopur.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/74020979435.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/45f4560ca37afc20ccf7ada7c38590ba/90495878545.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/zuxer.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210529_062536.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766608e378c---vapax.pdfIn PDF document text
    • http://uamarkets.com/images/file/ravufosopadaboseg.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ummikmgsl38v066f6mo8dd7u05/23730489039.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/53794443405.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11b035ec0e4d0de1e494ea8364da8721/zixugagura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+masked+singer+lion+full+performance+california+dreaminPDF 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_off0001ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5BC 18804 bytes
SHA-256: 983bac6123c2cac2e2098d430baa2b54560b8ef97e603123eed092d4fae1f8cb
font_02_sfnt_off0002264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2264C 11124 bytes
SHA-256: 475aa9d15276a7a32ac24ebac1fbd6435251510e7fecf47ad9e02942af351f57

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