Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae59a0a736af7bb…

MALICIOUS

PDF

88.1 KB Created: 2021-08-15 06:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cb90e3c70bf07c6cc76813a91d5bbd1 SHA-1: ef967aeb6ccff58a84b483c1f0c4f49197fc04e3 SHA-256: 1ae59a0a736af7bbe11164f43e110b1594bdc452299cb7975b39b27f6a58770d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's used to redirect users to potentially harmful content. The presence of external URI heuristics and compromised CMS upload links further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://oniceh.ru/uplcv?utm_term=analise+morfologica+exercicios+com+gabarito+pdf PDF link annotation
    • https://hosvagyok.hu/userfiles/file/16027315501.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87864759154.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/69016329397.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/paragu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c1e93966806a0b48c36ce83c3616c2c4/katedisokuvogigopunix.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7be0acf5---sedowusem.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/14814032260.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083811b03bfe---boberarejaxokoxibawavilo.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/zuwoxeluvoti.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/69001870369.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/87730307186.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b189e7ad9f---mulobodizifade.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/biradagozakotenom.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161100a15b1929---41841975864.pdfIn PDF document text
    • http://benrassam.com/uploads/files/91717841674.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/69959378844.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/loludidelafolekisexiwap.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a742ed7aa5---jomilutamutobukozijizibeb.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdac0295d52---64116364128.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/rovudekabovutanogagigeva.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/30961170448.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091155aeb549---bagadev.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087537830c46---neziwexiriwogejudosexutik.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/15/file/jiwepa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 18856 bytes
SHA-256: 03fc424e1ae26b8f0079e630e9f6122bd618622d5ddb2bbc7c8119fdea875772
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 11188 bytes
SHA-256: cf33fc9579e04d265ffba8b631f00a2f633937e0f0ee535e3b1d262937e11084
font_03_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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