Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3ae86b58247c49…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 08:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3773e52c7c366d1d1fa4951391e9df4a SHA-1: e2d4f1b376ebc96cf4a5b3195684c58e2710cc96 SHA-256: 2f3ae86b58247c49bfb10d68e2ca7c262ac769492b9e00271ac27d3bbb67c900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of external URIs like 'https://irlanc.ru/uplcv?utm_term=download+otg+assistant+app' further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=download+otg+assistant+app PDF link annotation
    • https://masterjobintl.com/ckfinder/userfiles/files/kewuxasebezu.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/84355544031.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/mifazogi.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/beboxipiratowutifilekasi.pdfIn PDF document text
    • https://banghenails.com/upload/file/7953781150.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/86844276213.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fddcabe91---98883748931.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/dutubepevafegifem.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/melomi.pdfIn PDF document text
    • http://agilesolutions.in/uploads/bigikexupuvubanaxenofe.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/30229304831.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/todetusigekupadugena.pdfIn PDF document text
    • http://isvpro.com/custom/files/sagama.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/susuzajoribizu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb651245bb---xapibiwuvademagosozux.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/87329519531.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tumuwuri.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54463993366.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc2b8e700---54077294415.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/fasokojanexib.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tomulubul.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8ca6c119---vubutal.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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10424 bytes
SHA-256: a6ad1f34a2e47fe269b08ff45baf9c529007a3112a093a282bb3a8a936e120e8
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 17620 bytes
SHA-256: 8705072d3f3f47478081d2ad866c76be3d370e7c9fa622bfa7bfa00f42b1dbdf
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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