Malicious PDF — malware analysis report

Static analysis result for SHA-256 e519585f8f8876ab…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 12:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 350257ec8bf97aedcc7729f570ddb74e SHA-1: 402e4e9753ac5349c9c0b4f4f5f1b5ad75a85286 SHA-256: e519585f8f8876ab36d77578cf68e025e20f25d51b7cb0c72209d72a448649dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://carrozzeriardue.it/userfiles/files/57231894726.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161333e264367b---4462552361.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1f9bdb1899be729888225b09b8e5914c/kinude.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/35566973259.pdfIn PDF document text
    • http://tradotel-riviera.com/file/jejarakomutajero.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/30597007811.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109050437493268.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/kotelumadiwenodopapuro.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/lisakosabe.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/muwesomogiribazuwedexuj.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/22273398728.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161346c789a81d---48319479106.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/25547036342.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/60957106808.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/31552741804.pdfIn PDF document text
    • http://abwessex.com/uploads/files/narazibiviga.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasoxoj.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tonixixumigowowetiraxa.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/tofisefalisirulu.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/4776468721.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/lepel.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/tuxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dragon+city+mod+apk+free+shoppingPDF 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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 17228 bytes
SHA-256: 6007390af97fe7334b25cbd094c845d518060f4469a59a3eee07a67368a90bd2
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 11228 bytes
SHA-256: eb1a7b9614adb6eb1fdafd4f2c4d1edf9b634cb84e20115cf098a1e8ab33d21c
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1