Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4c650f770f40a9…

MALICIOUS

PDF

67.7 KB Created: 2021-09-22 10:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f06fe1598b579c3754a66ebfab541fc4 SHA-1: 7e1a03599fd0ce868cfc250fb87f6f89e977655e SHA-256: da4c650f770f40a9b56edbebc05bd00decebc0a753e273aa34e2c7ae4f4f7b04
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic PDF_IMAGE_LURE indicates a common tactic where a screenshot hides a malicious link. The PDF_RANDOM_URL_LINK heuristic points to a suspicious URL, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document likely attempts to redirect the user to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=football+live+2020+hd+apk PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5016279---rezeboxaw.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/nemixuguritudoge.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kadawodawekuxobulumiwit.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/kurefuzonufudat.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/37198790762.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zifugasoxo.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdfIn PDF document text
    • https://korankertas.com/contents/files/91728934669.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/badoxuleb.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/pasidafutu.pdfIn PDF document text
    • http://3sdent.com/upload/files/zufezubes.pdfIn PDF document text
    • http://caythuocnam.org/images/files/muvuvojitosudibitu.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/64819794332.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210919060755.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c38f38064055b72a98c1a1dbf7c4b6f/34578541988.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f9f478c9d100ee35e7d66a459ea57a3b/446549345.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57937960772.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/65039104097.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kotolitarazo.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/55560055739.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/82785395861.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/53649769703.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/55741316418.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3c4998a2---2416367726.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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 14148 bytes
SHA-256: 9cb96e9b3b1d4d5fe871e3ff42437f10911817f997a606e13d11580c81aa02f4
font_01_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10632 bytes
SHA-256: 1e55c1f7fb6bfe79b87fa1456a1a3dae83815c02b96baeb45874a82d328af7cf
font_02_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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