Malicious PDF — malware analysis report

Static analysis result for SHA-256 25baf9343f876de9…

MALICIOUS

PDF

84.4 KB Created: 2021-08-14 12:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f82768c5adb8e51a0abb599b2c0c8be SHA-1: b4f0a5999f99cddb7132ec40d690882037376226 SHA-256: 25baf9343f876de90539ecf2486b49389318a47590619a47697b37aba866b4f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://computerzone.pk/file/wowonedona.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3409cb8ea1---dugezuwutinawemubadawuzu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/luxofetukekizin.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/53bda0c6e4096d23a08016899854bd3b/19657922693.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/gapatevuwak.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/802eb7b3bb8757ffe716107da220263c/bifelu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448ac8fa3b---78678648505.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/vugoxumurarozexekiti.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/21625473286.pdfIn PDF document text
    • http://chemicalengineers.ie/images/ziruvagexenije.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fd318a714569f2269adfdb93009dbcbb/19530732201.pdfIn PDF document text
    • http://berbun.com/user_img/file/35649749432.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/4870363119.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/96190376155.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/68073350036.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096c02d9b041---87285429569.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0f99147d---kirizasufilidujesazo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea36ca9fa7---1981167648.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/zagojunixiduvibazi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/mitikonakubavejupeg.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf317252e6---jofagugatusapiwis.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/9378335566.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bridgeport+series+ii+special+manualPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 17712 bytes
SHA-256: aafc080f7830411e92126303df5972117d200f87517ffaacfbb710df6b91bea9
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 11012 bytes
SHA-256: 2e1a1099df4d6e604efe587cb95919dbc28b6c3f83681937113db5a4d48d4b7c