Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4def4c813c595bf…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 03:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a523d40a1e9e4747699a8bf6300a0d20 SHA-1: 45c4490d1d92608bf4cdb264626c2ea72068c783 SHA-256: d4def4c813c595bfa3b7ec0348c11a9a01aac5f5187704d7912ef2ea16cfcefb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. It also contains numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aviapartner.biz/js/ckfinder/userfiles/files/20280369074.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/74232134737.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/44409500353.pdfIn PDF document text
    • http://topas.lt/userfiles/file/pidefebarer.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/betiwejuzitowajotu.pdfIn PDF document text
    • http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/89059889708.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/valoza.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/88348591172.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16aa993d98---40567416720.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbb3d777e---jinojekatakemew.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/319d7928257fdcce66114671a3b61909/fimokelu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe21c1a30df---29347319399.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musekijemerilafaves.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/345c484d864db4561d17bb951876f3f0/83340109071.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fi3p40880n3nsk2uvnno2fdhc3/86798699685.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/kipuwosunatosusodugimewu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/bemoxironefofi.pdfIn PDF document text
    • https://profesa.net/userFilesfile/47335905684.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/99af584ccf565369252f3c6e64a1150a/94994482343.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86f1e84ba---jakomotegojov.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/15436583748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+de+despiece+motor+honda+gx390PDF 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_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 11616 bytes
SHA-256: 52ebfc80687d7d23c23b8e5acf7a02ff1f2d9b487cbca0942ea739238c808aae
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 19536 bytes
SHA-256: b7ca5a8b205669c6760327621f9cc4d7470d848103e595217bad057a0a87ab44

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