Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe413d6155f10e1…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 07:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d24a8a3964632da38a2baaafe70e94ce SHA-1: 910ca0f04b64e511c456b36420ad338cfc29b70d SHA-256: afe413d6155f10e1cabb654d0a5c40ba9d6dc4219b327ea2d193992ab720e454
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://saigonradio.com/userfiles/file/wezadakega.pdf In PDF document text
    • http://hengfengpaper.com/filespath/files/20210911172312.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/65524403747.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/lapuzubitugazoxavinupife.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/veragol.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xatepeluxopud.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/15490702336.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/37462947041.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lebagamixuzakifunidadipoz.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/givulokarofexusa.pdfIn PDF document text
    • http://susutour.com/userfile/file/liditirunepuwubutupi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6s2bkrlr1qvgmb6a26412rtlrr/petuzozivelugok.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092823065573499.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/59920536853.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210902_B01E7BF4397C1D5C.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47861887300.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534a22d7da---76160443862.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/8295856109.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/31058254458.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tobosetujuwebunutudo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/zamufefozobufu.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210918095345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=limitations+of+bronsted+lowry+conceptPDF 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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 15328 bytes
SHA-256: eb41834132656497b5fe21022f85eae82f80a6c9659bea5bf27eb5812b6321c1
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 11080 bytes
SHA-256: 207ae1e5a2a80b75502f0f0d7e5f7534a584b7e3d318e82e5b7aa8ec94fc7db1
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1