Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f0553e78687ad7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 00:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d05175511babb64526ad5a6e51d7a558 SHA-1: 86480ad4d63e9cd2daa4d668890159c229b6ad0c SHA-256: f1f0553e78687ad7b847daf5dbb3b47196c6d6332f5409ece7ca9c0a56eb9534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised 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 distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=android+webview+loadurl+local+file PDF link annotation
    • http://slsnn.ru/content/file/93851593467.pdfIn PDF document text
    • https://securitydm.com/slicice/file/veziwipusetenujum.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614402a85f6df---59031757013.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bimopax.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/97799733677.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/kalofibinukudasewitexuton.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/nixosiledemejemopa.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/12487294657.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/19333177638.pdfIn PDF document text
    • http://fxlcd.com/upload/file/dulijomoxofutogojoz.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/jesaxarebur.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b205299fea---riwotunuduw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341dc10a002---jifakufefosuvizitulof.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nasedazaxan.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/dasaxogesu.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/5538883943.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/51948920589.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/zaniwolazonogekimuva.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/46648617050.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/33422696046.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_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 17112 bytes
SHA-256: d8e561962068ac15e3293490e5270e51a2d0e59d4b5ad3d8ba1f9bb8640610a8
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16908 bytes
SHA-256: dd3d10d53c88dcb1939fafdf55fcf98c4d02aa9a9dac28297ce3fed7733e55e2