Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d93ee9491d4314…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 11:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1c5277249a8a696185dd3636ba52697 SHA-1: f6b86018bdbb33371c6956763ec29f1653f6765a SHA-256: d7d93ee9491d4314ac6e3c69edbefd82512d4b93be3c1fb98c38d1e94e9b8b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=music+theory+coloring+pages+pdf PDF link annotation
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28800476438.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/mitikolab.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/lotuxejo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/lirodu.pdfIn PDF document text
    • https://studiorampinelli.com/file/nabokivujam.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/86fbe2428ce0c6b1e389eb6c27910637/labapeka.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/doretikabikawasakisob.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b05c3549f15f8845fb2a0eb1d1d542c3/dalolobu.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/48518181623.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/zawebogapipujewefibov.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb764718e19---86523657662.pdfIn PDF document text
    • https://wineart.online/userfiles/file/zufibupanekeka.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/23618226660.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/taxunejovuk.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/durozewenibokige.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/jt3or5j7l7dtt87ubcqfagg83g/sajojikurafar.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/65564475519.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/941e1da48c73ece2a2b1fbb4cbc5a402/5807226281.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210723184505.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 17488 bytes
SHA-256: d104c4b8c400c285571726f6f374a54848b891544220f1676c1454faeb74daac
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 11108 bytes
SHA-256: 3173346565a6b6e7c2e2eb15ee4b73808fbb138fb84da04c05c3b57fa7ddbaac