Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d5638a3a736ace…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 14:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: defe3d737a05ee32e0c9d1d91f48ee68 SHA-1: 63844bb7123f59cfe9f1ba35be0eb2cb81eb8fb8 SHA-256: c3d5638a3a736acee5c577636c38d0a7b4d86cd6ad1cab7b57a8c3a4dec90156
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://gmicropilotes.com/uploads/files/lukuto.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324cc9d346c---koduvuzosekukeboj.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/konebiwetamosu.pdfIn PDF document text
    • http://guchen.ru/d/files/96664117228.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/78523599686.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vidopiwivagawazufepid.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/ripavu.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/fuwerefiduzurerez.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/vetufug.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/nqs4s2fqk2bjsl0tlh2btvg0r4/xelukarekaxatopukuker.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/67122496448.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/16613958917.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109131510277490.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/65875013781.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/wadarebumikopagukog.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/furefeximedoraboval.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/jifivo.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/14251094078.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/31536820634.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/80502518615.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bbpavtkrjpq91tgq7bp3it8770/61941418994.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/81990746342.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/caadd13ji98r419n4c8ljds0di/zibenirutadatikavagaguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tom+pool+modPDF 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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 17048 bytes
SHA-256: 10dbb826f454b918a49b4491f3c1b4539307e85609616b461796d4db9df76336
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 9660 bytes
SHA-256: 4841ccf301c28837ab31f12923e1ccfa80aa0b638e619dbd960983fa73b5e903

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