Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2a0474660d1adf…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 13:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e26204a4253d05122acac233d96f9341 SHA-1: 44ea1a8dcd5f9301a4af5f4d981efc22a10494d9 SHA-256: bc2a0474660d1adf484bd45ccb76c0690f939327984b49fabb5f6da19fe46664
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=best+leia+builds+for+android PDF link annotation
    • http://cncforginghammer.com/d/files/wanaloxiduzasamovub.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/41020880373.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/da2cb018d99f3cbc66a1cb0d16515bf3/mobaxikemaduba.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/totasa.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/93f1c017c94c073eb83b32a5421fe7c1/57149608524.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/63001653305.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/81861132162.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a24361e6dfe1d3bf4d517664ba08b31e/serosepidafikipiboze.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/pebekozomakibusoterafis.pdfIn PDF document text
    • http://iltorg.ru/upload/file/rilosunenerulolasolizixir.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • http://ecole.ru/text/images/file/sikomavefetamevekukam.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/61532284450.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lavubobexojupoxurogi.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/94327397141.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/vuxarujexarapiloxukuvivom.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/37224018499.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580b9a6282---kejavaxuba.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/740433867.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/domuvefejigudofix.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112e5e9b2c---17108499939.pdfIn PDF document text
    • https://hirurgija.me/files/xunifolawipelewak.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/polefevisuvusonesixozaw.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/baloluligulosononuba.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wobifogepumiwexagisenar.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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 10640 bytes
SHA-256: 8405224481a1bf9078d8f1780f6ec6b9ff894f61a9d8dace9814f88de408e36a
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16732 bytes
SHA-256: 08b6ed1086e9e499457ac9c0f6c15f8fbe8021945ea33b916831fc24e3113d71
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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