Malicious PDF — malware analysis report

Static analysis result for SHA-256 1120dd3f7052fc82…

MALICIOUS

PDF

83.3 KB Created: 2021-07-18 19:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92570b62465ef7f0be4cc5936e0fcd40 SHA-1: c2db675fa1f3f99dd7d306e4f3b6f74969fffbc5 SHA-256: 1120dd3f7052fc821d21e1ece698ff13dadac0df184523ad03479d0e0544dd39
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. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs hosted on compromised or disposable domains. These links are likely intended to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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 https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3fc398a498ca1443013aecd0e73b027e/56440922188.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/96327957760.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015ae5955---74530708486.pdfIn PDF document text
    • https://landi-bg.com/images/file/tajuzeta.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/derujo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/22940194838.pdfIn PDF document text
    • http://debden.org/userfiles/file/nagetek.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/11089301326.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/73849410758.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/dudelufuw.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980b2bdae26---porilopugomurefugad.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/je8pejql1o83lcdkv5rp46n8e2/tefuv.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98be35cb40---92970044086.pdfIn PDF document text
    • https://actorconseil.com/files/file/xiwaximewikozulukujimu.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/gozonuzariselepedos.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b502cc57---92510341485.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcda10d227---vitetifakomotixadel.pdfPDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/57038e6f1cc9e6bd70b685f4a97d9fe5/7680740137.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/39083261196.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9da08c9c282a277cff55cd8b9f71b876/56569457928.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608421103db36---15320692305.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ae1e6f6ce2a4e7e6c8e805ad0fba5676/1117838203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=expected+npv+calculatorPDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10500 bytes
SHA-256: 5856a7c1d0adf0243d94f1c7571060503923a7571b94437c5e17bf932f3528f9
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16304 bytes
SHA-256: 2f242ddfcf86e3009e84b8b7bf8bdd98261698f8dba6ee7e78bb62032c1445ea
font_02_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1