Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b682414fa0e2a00…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 09:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 397565ee81018bb8e8e9fba50915d4ec SHA-1: a0bed3b8008a6a1db29fd032984070a70fac215f SHA-256: 2b682414fa0e2a0020af5e9b13ff040325bf17236bde3aedb184081944f5f4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

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 http://extintoresorigen.com/images/editor/33916991858.pdf In PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/84cf9029d8875b896c4309e200615299/bivaraboxidojipitejoxewod.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/15371bcecc917b570db62279f57255fb/76128258345.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d150701122---76639252322.pdfIn PDF document text
    • http://aplus.to/userfiles/file/zaluzosibejefijupewokija.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd7c2c866---milar.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9596d22f3e---wunufenija.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/89cabc85dab0dccfb203f629db6fd157/96012518298.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/silexuxuk.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/jonaniriboret.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738048a5a5c---zatipafilasav.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/92785427135.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/benupadu.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/dowoninedukamikuwital.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49d6be73cc1cb7f6b7f23757fc9caab0/vikiwamulutebog.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/m039spvugdo122dflritdt4fo3/zebuxig.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nujezogigunumutevexizopi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/78082073477.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0b3a8556d161678f765597485d4d1c81/75381422633.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074460c14c59---67852921670.pdfIn PDF document text
    • http://gtshotel.it/images/file/49014014092.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/88117835545.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/jazarurevapixazuzuxuxidi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086c555557dc---xetegitenukenixukozufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cpl+section+170.55PDF 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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 10560 bytes
SHA-256: 14f12f472d102592bd69b8c12c77c9789fb51719c2042d93804fc5b4b51312d1
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16772 bytes
SHA-256: 0fb9be0e9d0a232dcbf2906bc69bdd06356986008e9ccba58534079db48606fc
font_02_sfnt_off00012a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1