Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1298cd4dc43a04…

MALICIOUS

PDF

85.6 KB Created: 2021-08-23 16:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7993ac659a4c9bedf429b9969acb2f2a SHA-1: f1d6f0bf2dbbfad857f44bc0a89121a4ae39d74f SHA-256: ad1298cd4dc43a04820826924d6924c35bc8b0055eb8b270a1212d4b227ba2fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs pointing to various domains, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://czdashan.cn/uploadfile/file/2021042922242873499.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6cbaada0---28644862348.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f463a9159b9---79076473192.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/wiguzad.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117e6810a0c3---taxusajoxuw.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076230c5b176---81098262144.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4760db3f1b---80496846188.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/64311443800.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd87b48446---dizipexumazogulexunefela.pdfPDF link annotation
    • http://nakajima-ya.com/upload/save_image/files/41046590799.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8fdcec0e1---23208598661.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/nojuforodajak.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/weterujubimu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a616f8b0---sajiredusosefotuxomuruki.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/75967368491.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b731ff4c754---40330593.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/68538682225.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/34102470263.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/zokopomos.pdfIn PDF document text
    • https://anfauglir.com/images/file/fuvexagolopizidav.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/735860b15054770cb491f5b997506981/resururotofolitovaradito.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/2602132041.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/93251898788.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2911019d52---bofeveje.pdfIn PDF document text
    • http://naucseto.cz/storage/kikifoguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wife+with+wifePDF 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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 9688 bytes
SHA-256: 7ba34885dc0bfbba23b43974b6a0bb0f5d12f116851b054a03f5d647a1ba1930
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 17636 bytes
SHA-256: 4a791b8bd733269a71ede396dee37d214cf41ef70067c76a795247091e1f9687
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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