Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2494e69e56ea26…

MALICIOUS

PDF

103.8 KB Created: 2021-07-05 10:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5588e2cef5abbaaf4ac12f2a396272b0 SHA-1: b6b8184f188866717ff475c494360eb651a267c0 SHA-256: ec2494e69e56ea26540528be756a025c2b53497058c8cc427e4a95c9cd390e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/859f5fab25c2a36eb13af529606345cb/ligodov.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089d568e0763---51624337470.pdfIn PDF document text
    • http://techbis.pl/files/file/44386891824.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160958c92249a2---zududujukivawuzopedaxi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3cff76d546ce6733411c06c9b1e80c72/2546163937.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607274c7e04a8---46061145765.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/lixogudokano.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/gadojewadise.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8d046f2d0---8080430894.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3086dd9f26991964058e4c9db83016aa/36192692159.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/686edb54bb1e3e5981cc6b2f414ba24d/vefuniwuwugix.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/54f3b487c9339d4e8bfc154935d9d681/73370292350.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/23902106393.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bpva6gpd4d51ke83ojopjh9rg6/mososa.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa49ad030---togijotamenededuragudopi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/16941642560.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/230d46429402d052fb270fa3b2014cce/27011374978.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607873f387e9e---90828258957.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kujukurizugizata.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/zoxirozidusaximusig.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608007d99ac73---paduvipojafenikipuw.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fa7tteshcqoug9k603c1ga8oia/fadekoxinepuvoxofokutebaf.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f5a91175d9df89399de2f95c870ce43c/7636114754.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8022980804---watolabakopen.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7k369a7misq1cv6t065j7me833/xinegikikimapenunoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gaze+tamil+meaningPDF 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
stream_004_off00010769.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10769 25276 bytes
SHA-256: ad629a854c8b71edf68636d47bf3313310684fd0cb2918012a6653d27986e19c
font_00_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 10164 bytes
SHA-256: a46a23e59004c566fe374c5e6ae8eceabad1ec81757503dc251ca6526a582b00
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 4012 bytes
SHA-256: c0dd2b4bd9951d9906e745d168367231d86dc3ca56b3c94864a1295e134c643c
font_03_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 26336 bytes
SHA-256: 5220fcfc9e08da2520a2addce63ba97cb0679a423078737ea87bd212af832d14
font_04_sfnt_off000176fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.