Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e16dd2e7f186be…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 19:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6af24bca012415e603ed50cabde6255f SHA-1: 73fef20a561bee5fb5fbdde065b3acaa65c7986b SHA-256: 49e16dd2e7f186be66574ba261bfa3461171bd08229ec6eee470eab995dd9d07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/22525470037.pdf In PDF document text
    • http://kamakuralosgatos.com/uploads/files/56753074993.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/61312525882.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f0e5bb69---79203505874.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/pamiseba.pdfIn PDF document text
    • http://kaies.net/upfiles/21090314253896386742mt7f.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/49791489632.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/27616998053.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/xanilolikalugixiza.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/ligosesubixonawimuw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4a96dad7---39843126006.pdfIn PDF document text
    • http://epicridesnepal.com/files/sosako.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/56588074387.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcf06d238---21848342116.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/56835719048.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/fisoselonajiwewipomuniwa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f2c243ed---55497736966.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9c37b47b---73931253133.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/mematosaxa.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/sifunatagekururugowug.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/laladobudegabusavaliwox.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb5184b97---3352657991.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sonifuwumanixazaso.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wizuvusebapuvekopifagina.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/1347000584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+glamorous+life+of+sachiko+hanai+streamingPDF 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_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 10936 bytes
SHA-256: ce956a2a4762e7b167018a9516b113e7a551b0ff1d046be0a11d4c83c0cc85da
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 20208 bytes
SHA-256: ce2794a750bf21ff61ceaeae2882deac33bd3100bda937041ecfbf9ad27e8613

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