Malicious PDF — malware analysis report

Static analysis result for SHA-256 d814b147e6f70eb3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 14:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f6dc03d91f0208a40e1e34fcf8a9443 SHA-1: 57cd6fda54eec5b606112e68121bf0f584fb829c SHA-256: d814b147e6f70eb35022587d3ca80eff66c67caa9b8287b35850c797751f448f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple compromised CMS upload links further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://orig-shop-gsm.ro/ckfinder/userfiles/files/29188434408.pdf In PDF document text
    • http://haenuri.net/ckupload/files/45161067830.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/jukir.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/75998957651.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140063ea3834---54177233472.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tenigu.pdfIn PDF document text
    • https://vendax.ro/files/file/sizived.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/49946146717.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pavizawokirodivaxowulumix.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/41452967789.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/54115809362.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f612e3bf8df6e3c333bce2428c78e72e/dewuve.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/79248231775.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/52561721399.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51942114633.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/nudofadixitikegasitevutu.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/madidekisejenu.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/8146302743.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d690844e---2687428408.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/27506305337.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/24184640748.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kasubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+random+walk+down+wall+street+burton+malkiel+pdfPDF 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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 11060 bytes
SHA-256: ce54421a213f71e885ae65b43e5788fbdd68728a69a98b93a1b9ce56c77b8ffa
font_02_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 17852 bytes
SHA-256: 3dc16102b027ed55bbb205735718945f5855fb643604f0aa5cfa0816e75d5e4c