Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3921bb2b77e41f…

MALICIOUS

PDF

81.8 KB Created: 2021-08-23 17:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92d53f0df2d1ed4f8c6e47343441fb75 SHA-1: 094d1c5468c69c365a28c7600b8c4a8816d7edff SHA-256: ab3921bb2b77e41fa0072999bdb458258bd5a235d31573562f044e0f936f89e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable domains, suggesting an attempt to obscure the final malicious destination and evade detection. The presence of embedded JavaScript and the link farm structure strongly suggest an attack pattern aimed at user redirection for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ferado.vn/userfiles/file/mosizilosokalezimum.pdf In PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/bulegeliritujij.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1f2cfba510d69cf9e0c78aa615e172ab/27157151217.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/sisemi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2cd78bdc---dowopafudet.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hdbpj64ceobta5fs3vvr31b294/tupipujebipomajojun.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f953df992c80dd7a5481f15a225b62e8/sekaro.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/78811502151.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jeximikologuduvovuxulo.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/85592154003.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/59387549145.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a3bd98dc---29996465890.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/31191068317.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0633337ad818d7c9b229d3ad71d24d24/34255434262.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/86385728064.pdfIn PDF document text
    • http://terrietanaka.com/library/files/41021951200.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ibr2gu5k3g5t1dvttn189bhhrl/12952587965.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/90340661700.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/5849201096.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/59edf9182332bf416f3bb147aeafdf5c/niwitupugenelag.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/takebena.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/fuzisokelas.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fb26d04c---43677070533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+whip+creamPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/puzunodofunufibutodemaret.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10400 bytes
SHA-256: 3815efab97743c487876481bcf45a3776eb9e80cebd5c4436a7c16b2d03208fc
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 16312 bytes
SHA-256: b712d77d3bf8d556d34d5b24ac3fcabf7af94bc5b3f299cca3ce85d39d37619d

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