Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb67d491063e82a…

MALICIOUS

PDF

93.3 KB Created: 2021-08-18 12:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38e3804e285aaace7dbe5e61396b500b SHA-1: f1098459480466b06838341e927d3caa9eabf27a SHA-256: 0cb67d491063e82a046fb8ff22edc7ef1ca094274fee936f33b0ce3f3687305c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the document structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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 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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ad0a195---73659203876.pdf In PDF document text
    • http://uptownherndon.com/uploads/files/vofenufijovinegewamowet.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/depojufodoxumaxaromiluz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/41004820107.pdfIn PDF document text
    • http://intergeored.com/upload/File/degonutexamuwolu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c888726a4f---zunuraxafuzeka.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/92880312817.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5md7e11b2m8cahjhrpl9u8rnc3/mejexum.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gilana.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607123575515e---xewirex.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7f88404eeaa58e92ca10f446581587ed/lugobivuruvolopuv.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/suxozov.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/nuronomazoxamumuroxetefax.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081215595473499.pdfIn PDF document text
    • http://tano-cable.com/d/files/gimotomememukor.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/liwezis.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/kezeminonovibuzufom.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/59761259915.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/xevifurugibutatawali.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c57796eaf3a57e0c5a0ef66fd072d1c3/vemanupuwube.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/937f1a11a6f760d3c3375a06b0679577/8059211746.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0nm1qgvru3nsgd2honkc1jgo6/vekemudetiriwanusen.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cef0ad59---64955878119.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ef9c0e68---58667972309.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6a523ab18215c89292b60a2790f14e40/lobazigivapafudakexipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+free+movies+online+no+downloads+or+sign+upsPDF 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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 11312 bytes
SHA-256: 9517cce82640b65bfe12be12e45be76a17e6beca9ee1199781e7a06517ae8784
font_02_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 17492 bytes
SHA-256: 773afeda16d20bec0a49e537a2820d017e3b9da68065d8ffd8ca5a22b139e092