Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973aef825dfb749…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 02:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: ca45d475b62e52d297e9a840e32de3dd SHA-1: c546cd49ffc17d3221522085a0895d30b20249ab SHA-256: 4973aef825dfb749465ca0924147d8519adee5544b382dc396f3225fe5a3e736
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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://mudraconsultancy.com/uploads/files/40209824594.pdf In PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/82381118296.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607738dd0a060---dileteranipom.pdfIn PDF document text
    • http://iwishop.hu/file/redizitaxave.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/92433311243.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/82964265623.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/45910345301.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nujejigezidemobere.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6e0ad1a0fb9c35afec14ab55064a0d12/90031818730.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ca1bb839---6121573510.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9a8bb673d9820f2007001229dd863cdf/sijum.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e95e1db7---pederofelifil.pdfIn PDF document text
    • http://chinazzjx.com/d/files/gasuga.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/17214930815.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/welanoz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/lfj7dajg1alpc8c4shn1c860t1/gakegixorosezenawi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca210a645---42688764807.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/78121211739.pdfIn PDF document text
    • https://nasikampung.info/contents//files/55411689738.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/70153327944.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1c8e69f8---24038375138.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc61b9127e---35439486600.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/dakusazamutowaronije.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/879777b9c5aee43f8dbb2c1fd643a00f/dutikerufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=iso+27001+internal+audit+report+pdfPDF link annotation
    • 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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 16972 bytes
SHA-256: c4f4c8afe098b0dacacd7c0b796e676974486e58907a730662c4e5db18be6bdd
font_02_sfnt_off00014034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14034 10888 bytes
SHA-256: 5cdfd39ff10df12afe38b5b2f2b188eccfdb971e0a3e7b1b63b9f28babf23212