Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a1e6325472ab78…

MALICIOUS

PDF

112.8 KB Created: 2021-08-13 02:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b1c437c07a42b975ab494bb77719f22 SHA-1: ae3d2cf17a556d7d983166d81d8dcefc0f62e3f9 SHA-256: 13a1e6325472ab7869aa1fde2a20cbd307cd6d444b4ba84a2d280c370fa29e50
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The document also employs social engineering tactics, instructing the user to copy and paste commands into a terminal, which is a common lure to bypass security measures and execute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://swagath.co/new/ckfinder/userfiles/files/78512018647.pdf In PDF document text
    • https://rmduncanrealty.com/userfiles/files/32099798324.pdfIn PDF document text
    • http://www.heksan.com.pl/file/8139359530.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e3925a23f---vibekox.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e74b619b79898288d256a09173874453/28794928625.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/55e226b32fb3aac8aeb5691e7635ed01/88996103268.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/732e55248c4f20038f67c5ea09044e05/43071508972.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3daa80b6e6333453c0b3c3df6e280624/66996523930.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/zowixurogidifeperonejab.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160712130b7843---perepezusog.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/67714874107.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/58008217542.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/bixokumubiv.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe4ae8ca2b---fotugupujabiluzimi.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/45590181677.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/litotuzutejo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/67157669049.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/b0u0m65kr3guc1fjrt5ueln0u2/99703544436.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d268685e9c---pugumonoturubekuv.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/sunejimejufuta.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20f962d9d---domama.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2493ca7e---dunenefizegufata.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2f2750cb---30269108590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=insert+check+mark+nitro+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 18648 bytes
SHA-256: 6f4d80106a175e312289066ce6018faa3f7b9c3ec62793e29bba5dedf19954d6
font_01_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 3028 bytes
SHA-256: 2d2074228a9994574ee258839b02f1230c60834878250563b084a0563da10607
font_03_sfnt_off000156f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F7 26312 bytes
SHA-256: ca77fb0d51b9135c69988a6f00718a7d411c6d628dc4981ef1b2194d689b6fd5
font_04_sfnt_off00019b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1A 10884 bytes
SHA-256: eb4a4552fb23e44dddbaa4cc3e5377fa821874213cf57c41a663cdd1d9a452cc

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