Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96ac3c97fc9f38c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-28 17:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6234c4feeae6e465f8d6f08f0882feb SHA-1: 69c162793059219c1a1810a1dc5418a5caf3115c SHA-256: d96ac3c97fc9f38c876ab0e30fd6ab20dd1eede38d56076aa5ff47fb573ef9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host a large number of links, likely for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=know+that+the+weeknd PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/62722630077.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mesojemisumafozodonik.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/94566677382.pdfIn PDF document text
    • http://uamarkets.com/images/file/rokuvapibopoxilatenoko.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/ladojuderofexeseb.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/vukufitibozowisuwafomapo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1f65eddf29ffcb0b5239314df0e78546/7832280543.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/mubiki.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/fiduwoxamufivefirudi.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kokijizifepaxasiki.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/jazavonuxugumij.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/je8pejql1o83lcdkv5rp46n8e2/tefuv.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/83a3fbade18580cce632136ee78437a8/12471010793.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4589511690---pojojewegepofokutuwamome.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/jujotad.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5795f8f28c---pegilemiveweped.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/96711390316.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/jizabupegafafonisupiti.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/konoj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f410cd5a427---dubumovijikafaxojukivuri.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f81a27a2e---1841839420.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 17900 bytes
SHA-256: 42ff07999c4c4563f033df81ac567c739a5fd9fef3ccd60a9bcd4da6feb0961d
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 10108 bytes
SHA-256: f271eb5e3313b5d523ee887d853607759ae79c8225931dcff4aa43dc31d4035e

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