Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90a3ea0b60f9ab9…

MALICIOUS

PDF

78.0 KB Created: 2021-08-28 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eab4402634443ddacf3c481746def908 SHA-1: 6eab5ac502bc051b7b0e2d9544ed907c88d61ab7 SHA-256: e90a3ea0b60f9ab9098b2c65e2ff75556bf6aa771c6c84b5c1f449ee70b0b9c5
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 WordPress uploads and disposable hosting, suggesting a phishing or scam lure. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=remove+duplicates+between+two+excel+sheets PDF link annotation
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/38232585894.pdfIn PDF document text
    • https://raljob.com/userfiles/file/vazarotovoxogutofewij.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/19721959785.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/pumiwa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f81091a571b4c28fe0eb01aaa4d48c90/73746867474.pdfIn PDF document text
    • https://mauspro.net/upload/files/37535438717.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/zotap.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94160734107.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/pajuvilitabanixufoduvow.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b404ce655---tifosipajamojulo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ldkf04krslhdqh609i87dbv2q0/68469484146.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/36810796379.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/93846589805.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/53339681554.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/duviwiw.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/94709072540.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/791b555651b58774441a8576a2c323de/kaduzewifugeb.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a2f8c68d---17112095422.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/94968484922.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f89d8f5e9---xajeg.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24d858d76---92121229118.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd82113f5a---61977690484.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2svrtgkar0k2thq0b9u2f1lpho/5161183394.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/kodigekuw.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_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 11216 bytes
SHA-256: f372182e26a6cc8b2974d0745522955f54d40e6403cdb75a2780566a0313c6b4
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 17244 bytes
SHA-256: 7762bc409c5924120985bad88471a04b235ebe637ef08a0d0f5397d692b9631a
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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