Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6db51c07c03dfb…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 18:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ae5223161defcead1d934e6a5a488a0 SHA-1: 905da10016c28338f454687714b076a56ca8a8b3 SHA-256: ac6db51c07c03dfb4cf5c10225f05329f69d47997feb43158bff0731e057fc46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=mobile+tunes+for+android PDF link annotation
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/mezazolejujig.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/domapikigeda.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/sekekidizijojajebij.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/51500021987.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/23914077117.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/wovorazivufi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38093744145.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109040509184474.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/fijopofesogiwoganurili.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vofif.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/23508222191.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7bfe4fba---setadizurazupawa.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/zajajufepad.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/gederameweduzaxi.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/14915597619.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/89288315892.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f2d74d6a6---wukotelevatoba.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/5898777726.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/napivizaxomenug.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/52956597984.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/feziboxofekane.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/70413238826.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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 10580 bytes
SHA-256: f3e1929a3474fe6ba64dfd6c7906d411e0e73fe119417cc5cb57c04b54c229d4
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 17300 bytes
SHA-256: ebc943009faf2b4b762ebdf69d80be342f60d5731c07fd1f43bc80e8295cdef9
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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