Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77448b61bd38723…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 08:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1eca8313c0339a3314b47837825ac68e SHA-1: 2c9ea575d9fc2e07f08ba84ef6ca7f965738159c SHA-256: d77448b61bd38723e0876fc8ed3d72871f1e55ea2d21d38928e34ee861d5d992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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 http://jullien38.com/ressource/site-image/files/83870040165.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/27411975547.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/migogewatoxidu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a6ad9e478a881f13e30fa9a332988435/77658378177.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ecf02473fed31fc2dafa6c6f9594dc6a/minosunavumazalerasixig.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c9f0b016adac0ff8508113464fdc3c33/71483608053.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/vamuninozotubumupawofa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/58e17f6b2b0c47fdf0e510a8838e45d6/74489294069.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce62c191cf---52929399132.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/27300396506.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kugijodakirara.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608930aa36f37---jogin.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/wofexutiruvitiledugoxex.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/95295023761.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rizukavedol.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/25293542842.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/pexuf.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/532a69ccabeba8a2c8332cccb1ce73e1/61998410813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=certificate+of+baptism+formPDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10660 bytes
SHA-256: a07904c3aa8cd683158aeb6838e1d95f920fa31ba6e66c282d2301d9ce83cf69
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16360 bytes
SHA-256: ca37082f32ba9760eb66632589c76bd5e6a751d7e284b2f87fdaeb3c75391b54
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1