Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19f50de02fc3e16…

MALICIOUS

PDF

72.8 KB Created: 2021-09-08 12:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06327e5fc933a85432a4a72b096191c5 SHA-1: 9007a0e39da27a969c894803b74ad527a51a776f SHA-256: c19f50de02fc3e16127e9b2e11185d67c690b3ed806ec362d739b8a4d1319d47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, it features a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests the document is likely part of a phishing campaign or a distribution vector for further malware, aiming to lure users to download malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tipresentoio.it/images/file/32076972958.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lifivapopif.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/1754357267.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/71046057809.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/45831975297.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/52733097543.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b364cc2a---xetoluregovi.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/12987234624.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/pikuxewazavipewedovu.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/31041788644.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/begobewemebifo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/putofijizupare.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644487a52f---90356736825.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/6353039456.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93085502402.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108290529313226.pdfIn PDF document text
    • https://angkalaris.com/contents/files/50739281540.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/iqar77vti0a8sfacgc5227tgc2/38161273577.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5aadb9477951d943ffee4dad7ea826ab/12838140860.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fudaxujolirima.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/11762523946.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5d1d8d3107233ffc26d249262b9efe8e/66686483842.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815f02a21b9---funomififuwelo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed803cdcf9---tedelesibelexebivafedulob.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75189496743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=endress+hauser+fmu90+manual+portuguesPDF 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_off0000b869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 16020 bytes
SHA-256: a3a1bd0a5a1ffc369fe458549a47711d10fc5833b94aee794813f06d33606039
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 11228 bytes
SHA-256: e9f914b2be816f01936d9d4d5360cdbecb0cc610369fb79f4ca24145ca2aa4ec

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