Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df027aebf5670e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 09:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4b2774a87fa0b0e4c3485b11c70deac SHA-1: c4372a67982e1d3a8c0d17f5ffd71c7c14f935c9 SHA-256: 19df027aebf5670eda2e27150d7460d78fc288fcfcce4435560b5c620b668c74
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=football+manager+2015+google+play PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/687cd46bd28ba2f743c88e895494fcb4/dakugun.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/76664936893.pdfIn PDF document text
    • http://insei.eu/userfiles/files/21582724261.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/77006594296.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10342984295.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/70755566710.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/58415967856.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132817a024ad---wisasonovopiladunup.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/22932291137.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260626e6cc---lumurazikugewok.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5cdaacf---lesifigubobunide.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/48339018060.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/91062082092.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/8432784253.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vuzeronejimabixagovaxixe.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/28068883685.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/mulugo.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/gusel.pdfIn PDF document text
    • https://parfumzone.ro/files/file/43156269548.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/12266612078.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/kitizilitiruxudepus.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901103019561542.pdfIn PDF document text
    • https://limsurdua.com/contents/files/67535492843.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273e48e06---48706396257.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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10992 bytes
SHA-256: 2980d8b0a2ba0fd78618130a5d211692cfa9a41d11a6864569c2442676b26707
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 18216 bytes
SHA-256: 3063e34b3d5b480884ae73abcaa0e564e0c450a1f80d6bd764a4deeba3ffb800
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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