Malicious PDF — malware analysis report

Static analysis result for SHA-256 a799c9337807e258…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 20:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dee4da414cd9729f11e5eed276407006 SHA-1: 9b1ba136edca7833be3068ff15680df684223971 SHA-256: a799c9337807e258e2c5bbc0fdd008147aca6b27a9b4cfe02f0b8126471e9305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing attempt, likely to trick users into downloading further malicious payloads or submitting sensitive information under the guise of job applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=send+resume+for+job+mail PDF link annotation
    • http://royalgoodviewresort.com/Uploads/file/lejesujenigevure.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jugamizugapotanipufopota.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3iuil2vf8umae0jbl92i0gmj5m/13771313473.pdfIn PDF document text
    • http://sivam.pl/files/file/ruxixevozebupirifivina.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_144709.pdfIn PDF document text
    • http://tulga.ru/editor/files/88633782795.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/5337567884.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/60217530598.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/fomosudu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f2dc5c4---75559413582.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f1dc99080---79779026896.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/94897299974.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302aca93de8---manofikepapo.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75549567201.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/2138465848.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///11259781654.pdfIn PDF document text
    • http://gabortech.com/admin/file/pujipor.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/50094222288.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/nufulavu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/51991866106.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r0kl07bntbpsn5no53mcs4f5o1/7649942672.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/41797160379.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/86296584532.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/71452298229.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/67278891105.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/93196720856.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/95222774522.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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10860 bytes
SHA-256: 7387162c24054b821f988ea677c1547e69429f212538655264395d3922e7efe0
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 18552 bytes
SHA-256: aa35382deb46d5a9800bff56b826455c41084e5a7e08d4b177ff592e78d5b9ef

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