Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9419ebb161bce69…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 12:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c91fac18307511ab02b373b937885517 SHA-1: 7b4a52e5489a64ea6dd56573e7a9bf6b30bf7788 SHA-256: b9419ebb161bce693bfd904f757173940507853acf14393961e52ebbf08756b3
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and other domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=why+would+a+cat+cry+all+the+time PDF link annotation
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c8ac64ba---nuzabekemixewatuduje.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/77e217be1d9cb832868f81a382d85104/lubema.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/30635242565.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/3063886024.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/napipufoloma.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c36e7cab---81541403082.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/79612640299.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56544063167.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/10333355737.pdfIn PDF document text
    • http://willbramephotography.com/12425606212.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9427dd535---35202801341.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb420d895a7---46866571036.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/lh7gjao20vio90egdou5bthot4/xuzisumepuzixuzadur.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/22553883193.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cec399dcf3221c1e017dd925a09862b2/kaxaraxamaborupopabukino.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9fcc62a8---17211834525.pdfIn PDF document text
    • https://x-software.cz/data/file/rolomisedivafod.pdfIn PDF document text
    • http://insidethedigitaltrend.com/userfiles/file/xofikuwigepixugez.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff14693b24---rigagagawogevokarazakabo.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/56989664838.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qtb6un1cqbo703ubs9v1leusl1/13247057217.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_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17248 bytes
SHA-256: e869b13adda093eb8730cf82b4c7dab188a9e10a19bbd51a69d16f1cfc4d3197
font_01_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 10656 bytes
SHA-256: 7d4b1b5155cc636d03097dfefc9ee96239ecbd3fd7cd0a0b1a7850aad0c6d7e3

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