Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b885574d154dd1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fa14cd1189559ef447acfc9d9df4c41 SHA-1: 3e103fc211428669f149498ddcb58163cdb2af47 SHA-256: b1b885574d154dd19225fdf3470c872f6bb59c5d82a8fa73014fe68af39df958
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious actions or the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://drafthe.ru/uplcv?utm_term=all+video+downloader+vidmate+apk
    • http://ecompletecontact.com/ckfinder/userfiles/files/gewetapugakalobese.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e169b0292a---28462874540.pdf
    • http://interiorconsignments.com/media/file/lowexovizujatof.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/tojegukapavozumirumavalat.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/68521897171.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210915_21A1C17540AC5DB8.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q4bp0iljiaqlofqafjnl8shd52/dezirosid.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8434d21c---fibakixaxebesanalag.pdf
    • http://location-venise.com/italie_documents/files/74869510783.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321a6a87cb2---81909770538.pdf
    • http://akkoryazilim.com/userfiles/file/mukidigifelokos.pdf
    • http://one9five.com/userfiles/files/zimanipizuv.pdf
    • http://alompar.hu/uploads/content_files/files/xufulameregedimasowanoto.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/23377044056.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327f09462f1---43613403402.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/51472178924.pdf
    • https://tkbhanna.com/ckfinder/userfiles/files/68238243270.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef711610---sorazarinuwowowenefo.pdf
    • https://pabxlg.com/userfiles/file/zepamuragere.pdf
    • https://kingcarmotorista.net/uploads/files/79232602795.pdf
    • http://ikuma-car.com/js/upload/files/36005152346.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/80440500304.pdf
    • http://studiosaletta.it/userfiles/files/zijuw.pdf
    • http://lexen.ca/userfiles/files/79506504449.pdf
    • https://rachelrom.com/rescontent/file/65741392495.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafc.bin
f0dce86ad78bdba7e2b111b1e710dcb0d1cd7f7a5021a59e270e415f9c632e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 18032 bytes
font_01_sfnt_off0001097e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
font_02_sfnt_off00012195.bin
09d6b2b4c7a79bb3e64c8cfda90143d0289e3e5b72630722a064524f05ea57f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 10608 bytes