Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db3da4436435803…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 00:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db962bc8998113b5b31324ddf7a4718d SHA-1: 2b9daddab4f021c9afacc4e7fff74c51ce185471 SHA-256: 8db3da4436435803998d9a775d3ab15ab6dee9be7391e22409c574d0b91bf8b0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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://bodybybodyology.com/ckfinder/userfiles/files/jisuzu.pdf In PDF document text
    • https://thehouseproduction.net/file/jabusugubakuga.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xezawerakedoxulogeret.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/zavopalaburetig.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wibenokipusenukorijawos.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/36636998776.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pixevosokawiwux.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/boxuluzaluf.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/16515391340.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///63413798563.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/40844375055.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/11495198529.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/jozomogitalufozibisido.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141632fbedcd---jetoxikan.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f23aaf34---28613643684.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tqpfek97i9charghiueboef112/62212020558.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/34749677941.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oa9dfjtvca83rc7lslv5imtnp5/musupobutekiparomoge.pdfIn PDF document text
    • http://labsshop.com/d/files/gavegolafejedutesid.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/163543b8996099e2c354f592e75e9b14/kifonalaro.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9f2fc6116f03df0cc4a304991f725495/vosapo.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109061533374342.pdfIn PDF document text
    • http://chemicalengineers.ie/images/58817934783.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/webukepuwijuvoxigutifi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318beceb5e7---garutevawagekawew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+2+horror+movies+2021PDF 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_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 18400 bytes
SHA-256: 24cf8e6660260dbe0faa3d26895761816de8d517e7bbc9748b8a46965df554f7
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 11120 bytes
SHA-256: 542d76aadb7d61892539aba3347b715fc3fb34f036bb84f21114ab4c357ec628