Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e247698d7ae6b0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 04:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10b66daf08592b648cad5e61b6ab20eb SHA-1: 0b0ee488cf121d1656ea19ca617a3df4c0dedb86 SHA-256: 05e247698d7ae6b07ff6be291c4406fdefddffe15ef857fe81dd81ecdeedd4c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The numerous embedded URLs, many on unknown or potentially malicious domains, suggest an intent to redirect users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://grupposcorcia.it/userfiles/files/8747147561.pdf In PDF document text
    • http://gusanhightec.com/userData/board/file/45021887495.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/24148444083.pdfIn PDF document text
    • https://razredna-nastava.net/files/65822983159.pdfIn PDF document text
    • http://fceresources.com/ckfinder/userfiles/files/75609523304.pdfIn PDF document text
    • https://yuktogel.com/contents/files/52359870101.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuvajirizere.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/11877429728.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73df2270---lutapivaximufirixilolix.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sataxelemizekugasabos.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-12/20210912215708742364.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i813j29q3pho6r81ih302kcru7/naburesel.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/97808669314.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109020227169691.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/43322382365.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/55e4ee36a5e0a3c4ee2596a3a51ea8c0/51402113972.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/raxuwavux.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f5deled06k7hf459meatlmqsa2/21505331567.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/97191204834.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/vugujoguluzatanifulisusi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/58196987491.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/64675809537.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/fugudipuz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390503f3a55---48721380786.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/84204876006.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gixikepekoxigarij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sector+length+calculatorPDF 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_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 19168 bytes
SHA-256: b3e6aba90d52e8781e8e5f2e243489c549f63315623fa2631baeaa09ea2059fd
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 10424 bytes
SHA-256: 67d5075407f2992fdfadf015598a70514da38ce872b9a49243bcb77622ec7420

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