Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d3230af0e0772…

MALICIOUS

PDF

81.9 KB Created: 2021-07-21 18:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6849b9ecc0693aeaad60d0854e04f658 SHA-1: 2a6a185075a19888a813a8535e3cd26b5476334e SHA-256: 310d3230af0e07726ca30316a6df3b68448eb153adcbc50588969b572586d47c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to PDF files hosted on various domains. Heuristics indicate this is a link farm on disposable hosting, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://jvcc.cn/ckfinder/userfiles/files/2106101221573477118olss.pdf In PDF document text
    • https://ewt.cz/res/file/nagenuwijenokur.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078382734854---tezaz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8dd0cc30fd61cad09d790c6f4152cc5f/75521037312.pdfIn PDF document text
    • https://yuktogel.com/contents//files/62995793132.pdfIn PDF document text
    • http://email-database.info/userfiles/file/zowep.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/82394710258.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b108d2afdf5be96df97305577c5044b/62799929873.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/vizejis.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xamojasikix.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df855529736---pomixubose.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/pitogurezixufevizeboba.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/18392667907.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/pipefazexureve.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/runepijotuz.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lenir.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/53310529566.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f303bd72b74d78995763d2872c948996/61574001372.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d255dcf993cb04ed351b5237a9359113/nosixozepatukuxafaxodanu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c8fk216ma2n9uib9gh367p1kqs/5836341999.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d33p39gqp9nkmipkq5ntefq672/lajatewefunujadasumul.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210705050141_344141547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=two+categories+of+laser+printers+arePDF 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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10704 bytes
SHA-256: f8efd6bc25aa26acf2cd90799ca1c90fbe5bd56891979a54326077f9dd2e0fec
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16080 bytes
SHA-256: b474e031f08d78dd6d98caa357a4921c917b00162a65d6b91f6bfe29b66e6733
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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