Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c35ae518c39fe6d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 03:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f5775e2b7d502b380c5ed41e455c0642 SHA-1: 19e9f986a28f2ad9a61ce05c319fd86cb96c9206 SHA-256: 2c35ae518c39fe6daa5164d53d9a69cb864bf2dda121e9feea20bdfacba6066c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://vibrobeton.by/pics/files/41149948492.pdf In PDF document text
    • http://bidwoodmachine.com/d/files/gosizupaxorikilupexovira.pdfIn PDF document text
    • http://canadianrockies.info/files/file/60477018700.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/60326183960.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/11280727218.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/tebisimifusunanita.pdfIn PDF document text
    • http://debten.net/UserFiles/File/24751304653.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdfIn PDF document text
    • http://ty-int.com/files/files/fusexalabiz.pdfIn PDF document text
    • http://citranco.com/users/files/kuburixofi.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/61090478642.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jupk7kmdao133v7222kn0oa006/40874283994.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kamumaribadavemafe.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210919054636_1565301375.pdfIn PDF document text
    • https://trieurodata.ro/images/file/70513945002.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/61569779668.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/mutotopijes.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/39566912414.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/67630907471.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/edpl11b4oudb8mloebnlfagrpt/zewaribonesanupol.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111635046149.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/wunatema.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tugesane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tekken+2+psx+isoPDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 17728 bytes
SHA-256: 09f8605b8da6691325d24b2b0c73f55b6815068d15b6fdb0e5675175dc3420c7
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10116 bytes
SHA-256: 29d3adc2bc146a15afdcaac2eef548da3c6dce4064da859924fff81db4183c6c
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1