Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b28d4abfc7e9594…

MALICIOUS

PDF

82.3 KB Created: 2021-07-09 05:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c65f66f9de024dedab9004a0c98b2e6f SHA-1: eab3d8c3b3aef360c0ed9f6bb96b3a66d78a8b55 SHA-256: 7b28d4abfc7e9594623bf12093e9f75effad428800a60e3538f4f9fed1900e37
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. This structure is indicative of a link farm designed to redirect users to malicious destinations, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bancodevida.com/bancodevida/admin/images/image/file/73883234989.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b280363ba80---wojepasujovivirabubavisa.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e2e7bb09---52446257925.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p0ttfostct7iigsittgibmguv4/60831181365.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093031c9b3b9---bipawute.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fuvafupes.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607133cebb0ba---zakoxuwogadotaw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96366d62a3---17925895532.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/zatenarikolipededifome.pdfIn PDF document text
    • https://anfauglir.com/images/file/pupugisiwuzuzunipemezuw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b6f3bdbff08a9950ff6cc066f8c72f5/mukaw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3bbaaf046e854d93f74807af0504d154/guvudidepavona.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b547b685a---sawupuzifetowojifogujoki.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vrqo87afar4a955a2ci7gpkrb0/vigilupagutetoruronavije.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/vakifukezupel.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445133513a---17559818822.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/31073282857.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/22703633821.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r1eql8mj2j5a5r6roesj6vhqqa/taletewawedipi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/89238120544.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/rinatebanulumufuluzu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sulofuvelo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/kopokok.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11073821296094c20dccfc4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=4.7+inches+in+cmPDF 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 10068 bytes
SHA-256: 9c06dd09c7eb2dbf91d6aa90e23ede10876cf12807d78fb5fda346da215de505
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16324 bytes
SHA-256: 22ad0c946ebc895cf874faee5007a4910c6f98bf913b7b661b5ecddb043766ba
font_02_sfnt_off00012438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1