Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7c244cd983f5d6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 14:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84e4a11673250d55bb2469edde9e79a3 SHA-1: e2c462d8467f7b91ed0dda1f0a31d1c3444794d8 SHA-256: 5c7c244cd983f5d6f747336f01479c9919516ba48120ae13c8fede2137f34c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tencanpowder.com/d/files/15538509637.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60e59ed43---vubexojuzonarap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b80e74131---mofaxupixanotiwedabene.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xigifo.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/22265455548.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/799ff232807048e31559498d4a966ad5/wujejulogonisurababa.pdfIn PDF document text
    • http://vit-physio.de/file/70963937254.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/luxikalun.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/kuwipo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vobuzudawepamuvavo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cilmf8g2mrcopor5jugg9c7a53/pasimukowuwaxizagadowad.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vl5e83jtv0ld1h3222prdt8s5c/kodut.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/konopubo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0c816837---kudaxinitobuv.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/duberajimeziduzusawesumot.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609717d773548---63181774238.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/tukivujifumunur.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/nabilazomakiludowaluviba.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/pimufelujerajixagozapar.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3137b035---27758110032.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/xuxazemone.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/jesajen.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160949dac4aa29---vomuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wingstop+menu+and+prices+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 17796 bytes
SHA-256: 3aa9ffaef3063ffeec6d7d9effa17de5095717ffd42a368906d13186da1ef747
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 11012 bytes
SHA-256: 536bb5b506939fd177851303785b41344b786247391d66c56f86094e95f69fa4
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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