Malicious PDF — malware analysis report

Static analysis result for SHA-256 7034996604327079…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddfac9c5b39c61e63c7ef123dda5b6eb SHA-1: 03345b571720f664077de478cd7bcf82b21f2437 SHA-256: 7034996604327079a97a27ee480a7c1d4736410facef2968804ef1d8adb28a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c35858f504---84402490611.pdf In PDF document text
    • http://hc6999.com/userfiles/files/30517718151.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/31dfe91e9b0f432956e6269c4cc7c549/nizefanekite.pdfIn PDF document text
    • http://honda-vo.com/upload/file/39664823821.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/88883945547.pdfIn PDF document text
    • http://hanleyresources.com/images/zotabokotadulefazeteku.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3b3afc23111e2ae81d0bdb256d326886/96462342636.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/wuwevi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d023fb0452155eb83e163340db13cc4/nakinizugasisida.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/jofovedimobim.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/wewumunukenefugovivajeb.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/87588666037.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/zitakama.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xewulivuketoripemibinenof.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e59780b6351---72012663280.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609831bdbd2f6---6245626021.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/28940418405.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0e5ba7a7---nobapoduvebupa.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/63439010029.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/13203676031.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dnrokshufr1n880eileabjpmcu/mawudaniwasukunedobitos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0ff6001c---figipoz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hjq676g6spl23o199i82b3395p/gununaralaxepefipajepuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beginning+blend+worksheets+for+kindergartenPDF 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_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 11004 bytes
SHA-256: 68e4c322b23bbc4e317bff57c0a775abe902898177cfee7f2cbf246fb09f7a86
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 17184 bytes
SHA-256: 59f89de58bc19f18c1c685dd97684da0e18cee5f99850d361d3017e32e78a0a5

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