Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe2174bda806fff…

MALICIOUS

PDF

102.6 KB Created: 2021-07-07 02:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 253b4b8264cfdcc22c28db5bb7c17481 SHA-1: c556a1fda88431556a7e83d223cf192d1ab2d859 SHA-256: 5fe2174bda806fffdf5ab898d3b44a4eb9bc0ae8b1ba48a124e6492c932589ed
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0b3a0b9dc7f025068fe379b0e0e9b18e/baxewuponixajopa.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1u12kd40lsvbvahoh6sfkca9ff/xerin.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gadaxuduganulisuso.pdfIn PDF document text
    • https://network-italia.it/file/2781163987.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/mabatuselofubikujowawowi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2581b84bba2696ad151ada280ae1d5a9/15709075116.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/fajapemebapison.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf075a8dc7---tipexumibifage.pdfIn PDF document text
    • https://avela.md/userfiles/file/546485804.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/vubifijoxozuwedativi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779766e4f47---12312627301.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1fc7a26ce---36538883775.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a2028e948---wumilipewu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/18748553521.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a2d34afa---zifopilugozojezabe.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/29593304056.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/58aba8bcd21775cc54068d3492a27eee/40732224235.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb49b898a2---88669355466.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721074ecf2b---wegelenifatupamirek.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160890b4958189---jamanejaxewalarafebajila.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/tajijowazaseketaduv.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/iqsrpt9fg0e12nrgqro05jtm5e/ridenefilive.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/8321379850.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/229c6e8fc2d348037c49d02a0d412bc3/2937979380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pesticides+and+fertilizers+water+pollutionPDF link annotation
    • https://medlineplus.gov/waterpollution.htmlIn PDF document text
    • 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_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 17812 bytes
SHA-256: 25b958097d43d68a10c94773d02371bbf68f2de42130c1464e00a5d0963a25a0
font_01_sfnt_off00015b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B97 10860 bytes
SHA-256: c4c5fd13e4ca494c585b29fb0dbc96e73acc7a6371e2ccebccf88d7fb1a78bfc
font_02_sfnt_off000174e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1