Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd095989f32e49fa…

MALICIOUS

PDF

86.7 KB Created: 2021-09-23 20:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 088c3e17a882a3876a8b8a512c93fe51 SHA-1: 9bedb3c1b6af8ace3c590d492e62c7fd40a9a2a5 SHA-256: fd095989f32e49fac6e1687f063bc33f3f1486a8528d7ffe3aaedfc12ee2bc74
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The 'SE_MFA_LURE' heuristic strongly suggests the document's purpose is to harvest credentials by tricking users into approving MFA requests or entering one-time codes. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://tahyuh.com/uploads/files/202109160601515110.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/71059299190.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/marixikazaweriwatakesatuv.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/tejajolujukuvafijowoman.pdfIn PDF document text
    • http://0048.pl/48files/file/84649590933.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/kanimupakipuw.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/51938467472.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109101329064684.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/89909077248.pdfIn PDF document text
    • http://termocity.by/pics/files/50250194001.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xopipolak.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faafc0a107---figuxibotufedi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/xilafijigumexim.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/vinivogugin.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/78958924359.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2ttecvupr6k1e5p3squkgo5502/24036921455.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e4cdc91a1c781e41a153b2eb4efe7cf6/77835495472.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/povilozimopubamirebanew.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909143225.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37283505658.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210917112001.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52458415753.pdfIn PDF document text
    • http://df-2.de/images/daten/file/17313782158.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/winezoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+google+market+apk+for+androidPDF 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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 18440 bytes
SHA-256: 81e74d2631263d45a3f6c1de3bcb4ea632474659a828dff895f1dd686ad0ce66
font_02_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 10852 bytes
SHA-256: 23474e31fa7671fd419ad437adcb112d473d9d20c6427f6c786652808a58c64b

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