Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6078ba96d5fd79…

MALICIOUS

PDF

82.3 KB Created: 2021-07-17 05:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bca21a70a4106307036f877099a55002 SHA-1: 6fd6346110b7d81fc4602705480356b55176e73c SHA-256: 1b6078ba96d5fd7951381d02183f2673f4f0946698601c3a432a68a720b5a646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest a phishing or redirection attack, likely intended to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://accronline.com/userfiles/file/ziwasisezojorexababa.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/sewazifapovuzag.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pisojebex.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d97435559---tonudenulejutanaragerenim.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hnmbb29l7bkhkq1v9tio3eohie/narilafotapu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c2e9a48---safavakulerujenijarunazas.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/juxexibapojisamasenuwoze.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/926c754ea366fe085ca4f2b1292769e8/xudedet.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/41709033791.pdfIn PDF document text
    • http://headrepublic.pl/images/files/rubavebunogazudajug.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/585af9c8ccc71239ac767431764e9a01/laraf.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bf2d5dad4c77b994d316834d3eb6a06e/75933688405.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sefuweraxiremosij.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/33089658569.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/fipisitelasebifomumek.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2lp7ce1ccjirf109va97js83dn/bipile.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/roxovesatev.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48990c238---90815220076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=frequency+table+3rd+gradePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 17148 bytes
SHA-256: 3d7eb27072a8eda4e85c1d5a3f890a776962a76371d5fbdab994360254a86e4b
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16116 bytes
SHA-256: d74cf48de940ac729cd258cce0a55aab032f0e243ee8387f3aba300b52ed0121
font_03_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 10812 bytes
SHA-256: ff011e1d021b4f2a92f26596085b2927d47afc7d30246009dc5d13ea60b344ce

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