Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde583dc10203f5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 23:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4784ca51895589c5e0b14fa12ebebe6 SHA-1: 70b2c8eeaf1fb1d74856bea6022c5df6d3c94ef2 SHA-256: 9cde583dc10203f53c8f366cbc2d91fd40e1a4397f653932f950fc87be811e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious content. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=excalibur+dehydrator+recipes+pdf PDF link annotation
    • https://autosaloncenter.com/uploads/file/fetaludularodowevadot.pdfIn PDF document text
    • https://baglab.pl/galeria/file/45199510101.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/89491872322.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/da50nf0clk0h2cq35i3hskbihe/gorigaxuwudovagidivonuda.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/47185786448.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/wekagatujina.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725173861cc---79046134569.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021062601201373499.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/093dce06e8f34f4b1ced9ddbe62dfe27/26471011938.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210902_141917.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0afba04f---13039000313.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/rodumoxanetuf.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/86324217176.pdfIn PDF document text
    • http://yilip.net/userData/board/file/kemiloxanodedow.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/26854800661.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4fc7424b5d7ad7513a90398f6107e1ea/89726441393.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/23468099783.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/436b10fe8eca371d8027df94193c459d/foxojamedezagoja.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0v602a4van80c53p1rqaaijup2/xanazebo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a749f3378bc---76913712752.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/xenido.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/76159097845.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 17564 bytes
SHA-256: caa867f673392e9dec5ed207d573257900bba81b62ca8871b0320dfa42df815d
font_01_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 11052 bytes
SHA-256: 3776e5bc61939bc5ba6aa5331d677f16b5749c89d3d253d1ff6ea8d99e9edff5

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