Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b4e3f624129dd8…

MALICIOUS

PDF

90.5 KB Created: 2021-10-23 08:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-02
MD5: 557a3cf3bd1e4f6b46029613f59aaae5 SHA-1: 92c9a3b67a157af86078d33e3f172deb9238e870 SHA-256: 88b4e3f624129dd840a9b177cd889a4130e6487d7aeece7e41c0a384de0ba3a9
239 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to potentially malicious or compromised websites, including a known redirector and WordPress upload storage. The content appears to be a lure for pirated media or to trick users into clicking on malicious links under the guise of 'requirement modeling in software engineering'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of further payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=requirement+modeling+in+software+engineering+pdf In PDF document text
    • http://monikaknoblochova.com/userfiles/file/rabatitebijozafaxise.pdfIn PDF document text
    • https://afma.pt/site/upload/file/niruxigavotejeto.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164fc0c325af---lulir.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/25950308643.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/pugunexokika.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ad3bc9a6dd3f5a9e7f625c14be1481/mekalezugu.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22260657694.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/47520480464.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20211018201622.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-10-21/20211021012657455930.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21339263715.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/3504209595.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/sibuzamon.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/zimenejunoxexebapo.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20210928102913.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/julif.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b249607b---97388486751.pdfIn PDF document text
    • http://hidropro.hu/upload/60264326945.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/75532098081.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/26278702036.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/11694883429.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/lobete.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161437dec0434c---45609732777.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gipobofutubejomodapo.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 extracted file (font_00_sfnt_off0000f96d.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000f96d.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 11220 bytes
SHA-256: 02189159df30d1c0e6c16b30d043989a771424b586a90c4c33ae04d0b60059c8
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 18764 bytes
SHA-256: cb1855da8b68d609a44435ea8db39a9c7ee0ccdb4bcfd8a15864c1b7c07c3436