Malicious PDF — malware analysis report

Static analysis result for SHA-256 505129b2c40da22a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 04:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d11cd854bcdb10c0b841126e9756289 SHA-1: 37117c52f48607b397e25b701851a379b9d1c8d3 SHA-256: 505129b2c40da22ae70e9fa84a4437882bb5ec2af25e0fdf3d124434b61e44a7
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and links to websites, some of which are hosted on compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=best+office+suite+android PDF link annotation
    • http://verzorgingsindex.nl/images/uploads/43458920773.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wozisim.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8b34f36060e3f3605e57e8919cced8fb/46864670849.pdfIn PDF document text
    • https://gangnampools.com/contents/files/19896468714.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144424110526---69132764319.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/94067800786.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/68420444940.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///56267617508.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/26815029725.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/wepiwigudipefivonafik.pdfIn PDF document text
    • http://24cvety.ru/upload/files/35426416665.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xuzufexupitem.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bsujj45deeshprnnsr39s6knkn/90387342783.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/ruxowomerekepuwifivo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/98429863284.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131404792942---30157950821.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904210145509.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/14756341842.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/lujavizi.pdfIn PDF document text
    • http://jonme.net/ckupload/files/xoxuzimozitulavux.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/dikinusukedaxenuzaxe.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_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16744 bytes
SHA-256: 0ba15e50af1a48d4151675f0fa5cb8ea348a095a9fd0c14253e0208c6852df81
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10576 bytes
SHA-256: 254a1542128a35d7b88a86faae0816ee9139b8d03f00ec4c08d7092258a52bc8

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