Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff012eeb0cbb6262…

MALICIOUS

PDF

90.5 KB Created: 2021-08-04 13:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5b1598a38dd6f3a8397dbd44db7f87c SHA-1: a6d4d5374951df5faf07cc43fe3e5f16e8f43f5d SHA-256: ff012eeb0cbb6262f9ad0c4b0090efc72a89c7a322716fca7ab6c93fa8854f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a fake invoice or payment lure, and it hosts numerous links to other PDF files on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a secondary payload. No scripts were extracted, but the presence of multiple links to potentially malicious PDFs points to a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb396345d---69434512274.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1916da2---83448099244.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/06inooov5snkeh15e8qg53i5h7/kiludoxejiwo.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210715182630.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sixuloselanuwef.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/zurusonet.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9dcc1468c---51315280400.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c72b27f2---nawerumutawajerekotog.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773b3db3c7e---runoxosimod.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r8amm9at9t8lbjdf7lj3dncpbs/56517741787.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d799c7e6---17964615593.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84748ee36c---57299935998.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/efe55203f46ae7979bec738d6d580c5c/gekutax.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///lotifo.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/kugasidepegegogemixoji.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e5228e9---31626575469.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/35751758834.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ond6fu7n96n2fmssaggu1heph4/firabilinewupewanadamiga.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/88371323845.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb4a49fd8---21143934310.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/diluxagos.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/24148207044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aubasa+nueva+facturacion+electronicaPDF 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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 19544 bytes
SHA-256: fe6296ba4a9b81b2ac3d1848b95112fd7b6027c2bc289cd13de51c1ac0973f46
font_01_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 10616 bytes
SHA-256: 456d32723e85145d20374e4e7c715f6299fe4426436adbd157495bd71c55fda7
font_02_sfnt_off000141bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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