Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b0a6aa6757870…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 07:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d236315a7dd4b7cce355683a53e42fd6 SHA-1: 78167292366782144fc82e7d29a8588ad1321410 SHA-256: bd1b0a6aa6757870bb0bf0b39634417cecac3ebfcb59928775cfc5e94484931d
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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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=injector+ml+free+skin PDF link annotation
    • http://www.propper-droppers.nl/files/file/tasomaxujugizesuwelisuga.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/80394845459.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/diliwixoberewedaxazode.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/75133268014.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140339fb94f3---gagifona.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/suloladubevekazinuxun.pdfIn PDF document text
    • http://kezheng.net/Upload/file/kedikejolinipevape.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/51950198693.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323abcc3742---mazetusopenulokidu.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/papanane.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/30716763402.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/7952056904.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/69180151191.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sidutibegavulokopoxunej.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04adc13a9---42272641061.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/murigadolesezav.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/70761871340.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/juzolifisanofujexezotixef.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zukiwipakokibulajebe.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/11384127453.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/vixosozetosi.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/puretesazazo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/540c64a0801153011950ef075c31a8cd/zedipuvasapeziwopasofefi.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/zilivepu.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/sexaben.pdfIn PDF document text
    • https://estoniapools.com/contents/files/95806247482.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17592 bytes
SHA-256: fbc14f5f8fbedd88cfebe40c8f760156a972f85cc62359001153521637515936
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10508 bytes
SHA-256: cc3a7bb6315562ce9a052239daf56ae60a17ea5ef5ea204f8f923657b905aadf
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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