Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71dd3dd91beaacf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 00:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 951027e7078d05664cbcf74dac6fc9a7 SHA-1: bbac6296c5b52b19cf0983970008e2d18b8e9daa SHA-256: c71dd3dd91beaacfc992f8b9395c81e8defde63a4f4eb1080f8818fadcdadac5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b00311ef7cc41fe8f25f85835792e723/maguvujemuj.pdf In PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/dizajafojitaxakeli.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/piwobabataxo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/toxijovatikitavomofozu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/57843625603.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/11852125598.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210916221605.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/87711068570.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tagazuliberegonore.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/kagezaju.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lovurajasevutewaxirexaxep.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/jolexapoxunobam.pdfIn PDF document text
    • http://eichler-kammerer.de/josilumar.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/94892300674.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/52914180018.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/liseka.pdfIn PDF document text
    • https://tcremich.lu/files/files/timajozo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81b34e3a---kixoko.pdfIn PDF document text
    • https://mollis.rs/files/nanunino.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/wolujel.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/kolamubodagisipuvete.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099160120d---sapilosudejiwuge.pdfIn PDF document text
    • http://birdwatching.sk/media/file/46249052036.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/150803907.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/notebojobadonefufosafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+app+to+backup+android+phonePDF 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_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 10952 bytes
SHA-256: 3dfa6f33eff582a9f554b95b245f8ff2e1662dc9afd40d916e44a90df819c36c
font_01_sfnt_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16464 bytes
SHA-256: 1b4557c28521cd799f13fea1083c78f8663567328b8db61b0c1ba31ca8391451

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