Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ff2858b89ed66…

MALICIOUS

PDF

119.3 KB Created: 2021-07-24 12:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e8f3883486ea369330a907bbae929e8 SHA-1: 9040b93c3038eed7adb10d7fdfc6f277d141b502 SHA-256: 626ff2858b89ed66cde699522b73c4bf02a6ed48cb206ed470f79ff35fef8a96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/omqm53mharcjqlsbbi3aavdcjs/futuvulofifunisazomatabok.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1a1fb891a1b4b6a527fb58c6587b42a8/fiwamizejoruxujoso.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zaxexedazekelugivisor.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/dogufujisibi.pdfIn PDF document text
    • https://mmszke.hu/files/file/35062625484.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/zewowupivipawisejore.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd24d6388f7---ruvazemadapoz.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/dufidilapetazi.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0t8af5i6c3j7lajbqtdvoqo046/21558461840.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f13d2c1cb3a7c6d7b5f74151d5c7407c/9540836392.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/revofewujagamaw.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426649bb01---64758354811.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160937541383c7---wopitijidirapus.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tidatibigizuvijoto.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3473d61---5143980586.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ec25c9cd---62213447662.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba44272fe---tipeviduxalonir.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f773fa3ddc1---65405153108.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/48fd735e6d1d2d26500ba60824ba98f3/vagebapuxuludenawune.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce311dc10---51009176729.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/712ed63e1c5b64d06c00d504b70b92f5/26479945116.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d812766ca16---64789391404.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xiwulimaxokexej.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bd1414f27---59193005201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nivel+fonetico+fonologico+ejemplosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16576 10732 bytes
SHA-256: 0b32c66966d0289fe03e6c2cba2bf4cb2d776b091c9405bc35384282af0346d5
font_02_sfnt_off00017e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E19 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_03_sfnt_off00019337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19337 22036 bytes
SHA-256: 44b7eb5d46d06aa37f8c79fd8dfa50c6c0f9f70f5bc2cafc3202d2da39364019

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