Malicious PDF — malware analysis report

Static analysis result for SHA-256 6234d4e37fc16d9b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-31 10:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b681dfa90472bb6b2db0f8d27d0e302 SHA-1: cf82b13a0509b0c4aee6441ca1fd29dda5c2497f SHA-256: 6234d4e37fc16d9bde7b71b7bb8ee1cb708a1449016e9d6067ff4c43892cd883
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=mlive+mod+apk+unlock+room+2019 PDF link annotation
    • http://richwoods1969.com/clients/861079/File/wutepuponodiso.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/59378284544.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e6618db3---96175812817.pdfIn PDF document text
    • https://vestol.bg/files/file/zidetogokaje.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/tavilufumafaxiranalu.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/dazezanileropop.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adacba46f30---sedudomidenakezeporo.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/pujitalivunejozazemu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/46408012965.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sajoxugajakef.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sb2j86kak90jf4h1lffdhekj00/revuvovipifegoferaf.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28347630623.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/26839617053.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984123e84f9---juxabuvijabesofabenodima.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/029kidpk1h8s88gqr57lqlpuu3/kewofuvoraxe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd147398e6d---42153487071.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/begokijujumaxa.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/3pemd126n6uiefchmd6hjfv03t/xoxepefazabijogorak.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f1354ac4---tatugifefo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/garaza.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/jivupenigug.pdfIn 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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 11120 bytes
SHA-256: f17a328b6869eb52d4be2a9a1c0f31bd3fa1cd2f43ca857f1340e00c9940ec3c
font_02_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 16684 bytes
SHA-256: 93ea6932b4b049c528a612e5ab4df45b4a4b080bb851a1b815063ef79760775a