Malicious PDF — malware analysis report

Static analysis result for SHA-256 770c57d214b03262…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 14:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e80b6d9fdd16058cebab75459f46d688 SHA-1: f9e1de7471915943be95a73f448ed50e6c31f8a1 SHA-256: 770c57d214b03262e7f843af43cf604b7a853946a19157d089afd517ae35a668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://securitydm.eu/slicice/file/wugepidezajowarojomo.pdf In PDF document text
    • http://teleinwestor.com/userfiles/file/xosazusirotupamutoparuxo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/bexasubadukesunabage.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/fekedo.pdfIn PDF document text
    • https://rinducm1.com/contents//files/75704760447.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c63f053dab342fb12af9f17a3f6fb62b/punafigopajobego.pdfIn PDF document text
    • http://ausafe.net/images/art/files/ketutunobamofunodabuja.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0c6e196f---gujokagojitidax.pdfIn PDF document text
    • https://isleo.com/i_photos/file/mililoxuba.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vejonirelozuge.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/10263264657.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2e4e1570cfe601c5c6d74edf0dfe6440/taxoxowenezitomaka.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/427f0b595370e6233426697bf01a77aa/tiwijakosodojuj.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/pubuxubadojakolowitot.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb79358bf2---lalilazanutugalivu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fekop.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/62041630904.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160858e369e995---sejazasufewelujera.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/17232728686.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/44871293721.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/24110332130.pdfIn PDF document text
    • https://bataretak.com/img/files/file/lureginuwavibuzuf.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/55235461171.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/onoavi285d6mp6nvt3dfrnrf80/kubeziwijupimilog.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d5f25287c63daecee91d2aea3e148489/tuvutizinusuzotixovige.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd27d0150ee4c19b26c38be171f6c29c/77962837819.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tabipinizagobazejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercicios+isomeria+optica+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10716 bytes
SHA-256: 663919519c6c897d959078662df7d69347f23198be03aa7bfc9b687fa3e6380d
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 20060 bytes
SHA-256: 28fe64fce804ec70bbca51904c34deb0d4736a761363bb88b68e16c3c0288ac6

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