Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dae95d814409e54…

MALICIOUS

PDF

72.2 KB Created: 2021-08-27 22:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 189bcb06ef026c8c3c177a40d7f4958b SHA-1: c8049aaceaf5ba177b7229911037b2786191f1ca SHA-256: 3dae95d814409e54d05844dc941e5138a0e5fb64da92a23a5a000c32598a3c8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://motecx.com/images/file/varosanekel.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092578bcee07---53375758848.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/sigodegatavozujame.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/xipomimegudate.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65bacaea0---gokikiravo.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/95062007301.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/geboperebebojixu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/59208975170.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe82eb3fe---tuvakarawoso.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/23318498903.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16240503301087.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nurevupobej.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xanepofojedusofetaxoziro.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/2637250634.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/lomawo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/83940068044.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/moruwotufuvagom.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d716cddd---71470492686.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ee1822c7---ruliveka.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a5c30a4a6---65514993970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=electricity+pdf+notesPDF 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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16192 bytes
SHA-256: 94614b59d3c4258c4e4e4a2ccfe86f1c3acf3f425fc9557eb80a6001334a8f2c
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 10548 bytes
SHA-256: 83f72eb74e4b605743acab19807acf70f267f966e4c9b1daa952d443a49e8cd6
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1