Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca513e8ab34e327…

MALICIOUS

PDF

76.4 KB Created: 2021-06-08 19:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7d131b2a3fdf28cb3eb684acce4206dd SHA-1: f925bfb35712299308b7a795f05a76c27d76aa27 SHA-256: 9ca513e8ab34e327c1bd085c2be386433ded9e8409335229a02c8266f52f9b1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The presence of a 'download' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=kaithi+hd+movie PDF link annotation
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a14e77dbff28b63310fe5a0b68b1a27a/jesorufebedufazari.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2u7ja0k4fsd98qnk4iud1ast9u/lewapegovuragutopewoxewo.pdfIn PDF document text
    • https://majubesar.info/contents//files/69164946310.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/67975066104.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1983a988a51f53c76e086467753e889f/davomunipadofiz.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/42602972482.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/52445168308.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a32de62dee0---damerivizizabufigut.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50b8f07c---16999872668.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lumomuxikanofesinujedot.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5fb8206869d7a8abaf5dfb1ec646d357/79720248537.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/80997741194.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d394ab1---bitozaxijotoseputijid.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622174065.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-10/20210510142715230208.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/q4f19f1doc5lna3s24jthnn4h8/6692707508.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2763db2d40d853fa78aa11cc9b5fca2d/96865492522.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/jebuwe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68b30fa58---96642227879.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/16286633710.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f1ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1EE 3572 bytes
SHA-256: d4e4853449b72badb41c446c3bc5cf3c9067519e5c1bc168e5605a6cc87be359
font_00_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 3812 bytes
SHA-256: 2af6095f784abcfcaed963dfe43ec7d0e0e8228ca94b72327cfa16f57b670cb8
font_01_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 4788 bytes
SHA-256: 5b143f018c91979c3f617e26ea20a49ad5f09e1bfd017c56133d7449e4e9694c
font_03_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10716 bytes
SHA-256: ce9aa2da86be9ceb83f6b0d86f346fed187d6f39ca28c31b088defffa0131c70

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