Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aec62025a85562…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 00:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be0e460be7c24c11e478a9044b0c9670 SHA-1: dc419b7ca5971d665336ef92a2df6d720134527e SHA-256: e4aec62025a85562be83dce7f17de8995fdcd0307121f4f6e96741bce6e03e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest a phishing or malware distribution scheme, where users are lured to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdf In PDF document text
    • https://numen-wow.com/userfiles/cloud//files/lurifuxafuxew.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/48852493096.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/tevudelojafekubesino.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/44dbfcf20dfa9d56396b93878cc0de39/razejiluj.pdfIn PDF document text
    • http://hanifeugur.com/image/files/80365309210.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/b7c8d637f6905b46380dc19e35428f1e/9081891080.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6477297a---71827537180.pdfIn PDF document text
    • https://camelcarpet.org/d/files/14432093220.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/23275301600.pdfIn PDF document text
    • http://furniture83.com/upload/files/bevijit.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272d1ef64d---88763777592.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/16080469849.pdfIn PDF document text
    • http://ankarapianofestival.com/userfiles/file/66339273964.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2132223543.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8e81ca93---52361072503.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/95614579270.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd282b8c62e---70854098227.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/52908215031.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/29498407112.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16100c314d5d1c---kekesimoxogewekunedal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e80346d5---48978922455.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7989b90141---88234923307.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0803fa347a---fowasatira.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/24471365349.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af137705b89---7567918279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=magnitudes+electricas+fundamentales+pdfPDF 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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 18176 bytes
SHA-256: 36460c3e7dd6f0a5f190c6740f6594077214d62a5549d049e9830c40f41c2056
font_01_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 10936 bytes
SHA-256: 03583437d5583f3e471d26918141bb75e7849a8398665c31afe971864c29c8d5
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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