Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfdcc2e0bc4906e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 554b225381cb5dec86e2b00ffbeb89f8 SHA-1: 92d32cd31587781628e200981da2d191d06492f8 SHA-256: bbfdcc2e0bc4906e26bd5a14c67c04035efbc487eac60b7350c4ff349b3d5f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://synerhu.ru/uplcv?utm_term=cod+1+download+pc PDF link annotation
    • http://packamate.com/userfiles/9021347840.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/70641243348.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484b1f31991---zebolefovonejip.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/linijugobu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/6785891095.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/namuxo.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/19372128741.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/tamakajugitujitutitabawog.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/47294599283.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lujuf.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad5e7e841e---64300442597.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bb33751e07eb9ef8b67b1cd19041b0c5/nugotozikevunatomit.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/49408181222.pdfIn PDF document text
    • https://norservis.cz/files/files/kodegusixulikimifujutu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/dejejulidibesomuzuru.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/9901534752.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148120cccf7a---23104449470.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/27030086641.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/68104977611.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/22842426162.pdfIn PDF document text
    • http://surausa.com/uploads/files/gowonig.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52c042217---gulomasadadakojefetidogo.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916025333750964.pdfIn PDF document text
    • 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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10088 bytes
SHA-256: a7ee034fb269aa5e3b9dae9803472037978c59f9e06c3c1d7474f56d56d3d4d5
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 17520 bytes
SHA-256: 87bb78c4da57e23d018fac4ff6eb9a1d7b6b1508c7484eefe6c35a2afc3088ef