Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3441d47798ace0…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 23:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: caa09bfa1722d90d29aebe3d5e204d23 SHA-1: 75bb13c45365c101828cf64c28b2cc7fb1b3e0b6 SHA-256: 1f3441d47798ace049368c67a23aaccce7f45b40b2fadde2aefba8b2cf6d1759
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, some pointing to compromised WordPress sites and others to disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=manuale+installazione+videocitofono+bticino+classe+100 PDF link annotation
    • http://uzmansporzeminkaplama.com/resimler/files/puzinawiwowilipifofes.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xutuvavubokakezexapine.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c3c1eb4b---bitegopigufetafosiwab.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a01400a9f27c354b323d7092c88bb5eb/wededinot.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///26130903123.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/wirixekimowepamemile.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/34690983627.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753cfb7f06---80619974291.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9dff594dffc3799adc38c0e7c54f59a0/vemonoluwibapizowuzuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec70c6f52---newekoz.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c11f0d062---59941960341.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/pezerakiniratinijaj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/obhet9pa6ogj2d0tt2q1aftso6/lolafazulu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pojuranepunoxamegab.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/49058458384.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/patolupakezaluzag.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/konenadimesalu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1090e39299.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jum3ig3ss5uo7nnbr335jemmt1/94385044804.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/87557858391.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/54890723922.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zisobizisa.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vulawoda.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/65536406741.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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10904 bytes
SHA-256: 5e9eb529445deea0453be8f1af3dba183e916839f0d307d339ab7185b0ab31b6
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 17352 bytes
SHA-256: 1e5470e09466cc7703cae75c57770e6e299b94e8232ac128afb0bcb7facb5674
font_02_sfnt_off00013f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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