Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc0b5af1ae7b07c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dbb359b669044a46d996af33e0e76be SHA-1: 838c7802a400a09020636b05596be38bbfd0be64 SHA-256: 9cc0b5af1ae7b07c8c3f1c1398acf2e0d60f81600622c0a5c9ffaab8dd0aa31c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=qr+code+reader+app+iphone PDF link annotation
    • http://sangjeom.com/userfiles/file///dirorugilikonijomof.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/2489697732.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/37655044489.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/fopowixojawitasi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa578fb51---63411627531.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fevivefofofusoz.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/44230212970.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/figawo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903205522.pdfIn PDF document text
    • http://kite-surf.sk/files/xugawexodimawovil.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449612141a---taxizezofupude.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b6b84123---zupukila.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/salatir.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef4532c739c86dbb5ecad6e050b2c748/93689656045.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/60349669223.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19476329326.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/47148510772.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/72182637995.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc78892706---bulibotuzikipagenodanumar.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/3064433962.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://datenglagi.com/contents/files/rivakujinetivoxerad.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16335665742.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/tapamofajomivukimej.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10356 bytes
SHA-256: 7e821594e0b4e60665b97e8525b67a45b3dc0912a8c463182e8963f298a64334
font_02_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 17956 bytes
SHA-256: 312f8996bed8825093e1ac834f825e0366648ef9c4325deb7067816cf6fa8e78

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