Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099c7e9adbb0004…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f96fd7340d4b69ecd0acea1376b48c9 SHA-1: 08d12a68a9426f8a32964a2572857a2414dedd94 SHA-256: 5099c7e9adbb000424e6058451eaed40312298e96c21d6842e5a9765164f1347
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ajivikafinance.com/userfiles/file/tejagofigikasumumamepe.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/98714881604.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/54046751196.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/feromidumevurawisanuborex.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/vusewifimozadojowub.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/xisikimodibuv.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/isl5scb84fmdghqrjgdoedq670/8911031833.pdfIn PDF document text
    • http://ty-int.com/files/files/83672320769.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagabiw.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/71408123211.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/38am1pbg965klq9fpdatjohamt/jodafivukozakeko.pdfIn PDF document text
    • http://chamdure.com/DATA/files/98036681956.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/84533740157.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/99697379919.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/87cb4a68a3d7f8fa762ee0ce97459b81/zafuvudesulugiwujut.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/felulexinuvawixerejon.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/61640248937.pdfIn PDF document text
    • http://c-six.it/userfiles/files/26713525284.pdfIn PDF document text
    • https://latework.cz/soubory/jikofezodowetuxot.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/16/resojajebit.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kexowinaposukubase.pdfIn PDF document text
    • http://clickvay.com/upload/files/nusimobikorogusejidegiron.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133a61e3af22---sodivoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=widgets+android+samsungPDF 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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 18184 bytes
SHA-256: 15da0c7d51738fdd127d0659ed2642b797bc630e01c3c3856b177daa7d9b78c5
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 10636 bytes
SHA-256: d744759986d7782910a5ecdc2a1884abe84e8dafd5a3585b684055c1019d932e
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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