Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cf24819484a8c0…

MALICIOUS

PDF

102.2 KB Created: 2021-09-06 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b79a1ece4e6274f379bfba43cc10e05f SHA-1: dcd7e0d3c73bb950050708cc2ee70ce1d8cef45d SHA-256: c8cf24819484a8c01749446cee23462564a6b2e904ae2e925c25e127f6dacffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It features a link farm with numerous URLs, some hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the link farm structure points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=peltor+ws+workstyle+bluetooth+manual PDF link annotation
    • http://doremimarlikinsaat.com/userfiles/file/63831763668.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aca6d23a2---54489055300.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/43607769738.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/93595838751.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8e8ab7e8---87662565640.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/bekemapikew.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/41cbe7c1f97a9e1e60f9f1ae1062fbb8/xuwifasijo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/52595461819.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/71088767098.pdfIn PDF document text
    • http://midel.me/userfiles/file/xonenedozapuzoxikik.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b140e098---kifojaj.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/34102306509.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916bdc16785---kikutofaliso.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840be23c00a---13818010675.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/70409583693.pdfIn PDF document text
    • http://casaalu.com/luutru/files/tamipi.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/19048805075.pdfIn PDF document text
    • https://mollis.rs//files/22088576746.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c613440448e52e946e2fccd7201a50df/bapaxitawenovo.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/68006691059.pdfIn PDF document text
    • https://jetaime-shop.com/files/darilamapalajasow.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/26949490195.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e7b3m2jjtgkjkalmciqg0gcc03/vupigerule.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609846d4a8dae---44099443112.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/90b4k8h71l020vnkc03bh37pol/43733111031.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_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10816 bytes
SHA-256: 77b6b847c5dc46195f24e115a40c889f511e97c69a549ebe64d487a0b63ea8e7
font_01_sfnt_off00013c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C09 20820 bytes
SHA-256: 2aea2311aab14c37b5f496fd4a8f053688d6f17a112bec8b2ef4844728ef0060
font_02_sfnt_off00017287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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