Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f74c32842dbc9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 05:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1ccab79e61478aad301b19b30ab81dd SHA-1: 4605355d507323c343b4b9141858714e0e0f8a67 SHA-256: aa4f74c32842dbc971b2758c8a8c13ab0d21dbbd6b17ff6ac5313dbee99b14f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs indicate it is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=run+ons+and+fragments+worksheets+with+answers PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b321d7e2---degelajowowelewo.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/71777332672.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1920ef047733977564cb6b7c9f145d6e/34894949288.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a29ab6545b1f461f2ba9792a389c06ce/81316470979.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/57321970142.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/41790445431.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c3687f68.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608237f3d5008---xeseliruvelojologiz.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/28987272549.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202172112424.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/vamuluwojivari.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/7que26h6vau3o3okiu1siqa8dv/34826130116.pdfIn PDF document text
    • https://adikkedua.com/contents//files/12491918667.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/gobasemavofexov.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pilozusemosikuve.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f330a62e03---3323387848.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zixutowejobovavoxe.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f02aca900---92539993610.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/65c8mk0jfda996af8s2m8076ne/nalovepevemuzogeledirol.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/xixosa.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/6763776162.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/86006438686.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/81373042267.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_off0000c1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 11076 bytes
SHA-256: d00ed4b928ce2c22b11fa84a8e7ab67ecc164cdf4a3a54607059e37b88519fab
font_02_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17004 bytes
SHA-256: d062ccf991f0d01735f8a4e925f5020789192405143a0233dec5211264bf8acc

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