Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7030b105e71c8bd…

MALICIOUS

PDF

94.0 KB Created: 2021-07-24 16:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7ef55a16341321250d5c02ca7dfdd30 SHA-1: 91706abd82d66d20037a594528bdb53a2ca8ab02 SHA-256: a7030b105e71c8bd9d23782c31c0204fc824dee565ce55f2771ee66851194bc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attack pattern involving redirection to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a692703ec1---25520489500.pdf In PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/8d8ee90e77fa3e143c8f5479b56b2dbc/nadagiwiwoboxesonew.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d8ee37aba---pidebubo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68a1e3b98---26963717810.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa84d159216efa0037c87bad0cb4f539/tuxumed.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vulinipijuruzedasosutil.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/fikukotas.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zaxovuzuwotefopode.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/35156821433.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f4e143f6---zuwaduxuk.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce08bad258980904d923e898fb279200/71107891217.pdfIn PDF document text
    • http://polkovnik.su/upload/file/sifufamogukopetu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5956dc25fb1d09f699ac88332c24264b/76287894808.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/49kln6pe9a31ppcf4mg202v9mi/31507451729.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0c9953ba---39286708696.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/21887932506.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/76593299729.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/babivopoli.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a7538ad12126b632cd434bbca2817c00/watalukofo.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1627106715.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6ebc4402f84c70bfcb003af45bc80ecd/womifilus.pdfIn PDF document text
    • https://wsbtitan.com/images/file/20985273318.pdfIn PDF document text
    • http://esistore.de/userfiles/file/542386909.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6a6d2004---68220467768.pdfPDF link annotation
    • https://hoalavender.net/upload/files/57370875564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+test+likert+scale+dataPDF 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_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 17736 bytes
SHA-256: c1a2556f232233a24cc45c9daecfbf2a8020a4291aef4284a6e718b70092c52c
font_01_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 10428 bytes
SHA-256: 77e31ad7f9bd3e81eddc289cc1af170b47547817295e25e6d3497f1af38eef46
font_02_sfnt_off0001514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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