Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa18bd70a4af2e8c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 15:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 001aa56c679d73bb44de3fae57bd31a1 SHA-1: 323951a5ebe9177aa851a79562f35a684cc1bfba SHA-256: fa18bd70a4af2e8c8c0ae699545ebba7d85620326c9d91abb803d352c35e475a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=eastern+railway+reservation+form+pdf PDF link annotation
    • https://okazdedziecko.pl/_files/Media/file/botinexidazizupana.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/makudufosimamobamudimuda.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/21807912837.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b470d79b27---dikebiralixemikodu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d2987e53---56283030768.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051613433073499.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/94703945695.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/60290823576.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140cab84fa4---54347414347.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/12891561805.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/6906343702.pdfIn PDF document text
    • http://progetec.org/userfiles/files/55210222118.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/755326732.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i1bb6shpu0g0mk4kqqci45a471/bipudakaseburujogopama.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/fujarimetos.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/manuwuzunogub.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/33135350769.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zunejij.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd29e44e2b---zogunavokibajenofiviwifa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ef27ce03a---pijumuniwef.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/doruwodugog.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/68168672454.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210611160200_61bmzo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 20596 bytes
SHA-256: 93dc744b544071d16ed624de5b39de3ac61f371efc28a8d721e284b56ae49e8a
font_01_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 10908 bytes
SHA-256: df19e2085296d1aec272bff35d7b090af1b499e978d29f0b203e5cf2129f646d
font_03_sfnt_off00014211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14211 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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