Malicious PDF — malware analysis report

Static analysis result for SHA-256 996f431b9bf071c5…

MALICIOUS

PDF

96.6 KB Created: 2021-08-31 18:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 59c447685fa13cc98536b17a59637b3f SHA-1: 650057296d78fb6da7015629a042e549d4ec132f SHA-256: 996f431b9bf071c56fd1b958b8d170935f84a1b64091ccfbc70d49590fdd63e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://berettyotv.hu/userfiles/files/69888214250.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xavojexozige.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fda173c2---68324300779.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040614332825.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lexofasirej.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c2eef0be---53883598355.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/82490247058.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/41972766831.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/981957749ecfe6aebe67a8450a4b74df/womigefes.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6fa995e849cfec952410eeaddefe1485/mewugofomevidedodudikaxe.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277282e8bf0---rojomotiwulixerolozom.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5b48e81f---ruxifeguzedenevikizojawap.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/sixazesiwa.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108251628193943.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/285719ed4b27b6affff7beda02b2467f/49499048998.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5s0797j0pqakg3qfm4fd6usr32/tuvewotikejagarodove.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8b128735---lilevovumavuveradosavos.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/jiwonumomufexoxibebonu.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/59472576135.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/149002316f4e8d8ca42b4de774e33a4d/gadavijapa.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/detijekipaz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0ced42aa3d6fe70d729e4caedfda144a/mevipirifuxunijakikiwu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bf866f922---turowomafanijopovulilitok.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/winoweti.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/87087825928.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/32642353264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=myvegas+email+chipsPDF 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_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10572 bytes
SHA-256: 68ee7a143d0f83581d5eb0293b5cc6ce46ce1cf49a11ef680f798ec68c99a275
font_01_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 21144 bytes
SHA-256: c2342edcec4132c4318b60dc5b894688907ba121771423dd5fb2c3c846d20eff
font_02_sfnt_off00015c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1