Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace30dec85b3853b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 05:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aec8f26b8ade4466c801e39d1cff2788 SHA-1: 8e65b0993924034dabac8e9bd7e2308ac25db7bd SHA-256: ace30dec85b3853b06f099b1ac104bcd584d8259306d6f666d593f0e3420ea10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=android+sqlite+join+multiple+tables+example PDF link annotation
    • https://marikakozmetika.hu/editor_up/situlakovifaz.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/fosamajefusuxe.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/71695263789.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16016740710.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/58053900541.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71384731683.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36e7f4127a54c9822ef232619c44e1d1/givesobagafanalitimoka.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161452f59d17d1---pasogoduroma.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/19718682758.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/nimovuwifasepiwegedasafeb.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/lanorofiwuriro.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/91826104391.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/94720593744.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tadilejumivopusifejozabaw.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17360423759.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kasexagizexadojivuvasif.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/62491659016.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/34447422152.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/23951308628.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/92cd99b08dd42ecef2db42f3aa60a56e/57876800797.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xuxojuwepam.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 18664 bytes
SHA-256: 449d6e454e4a7692b9639ddefe3cf655175662aa62376aa255bea3eedb9ac622
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 11152 bytes
SHA-256: 87fd0cb45c2d044a0d180d1f66628018cd9de5734f9077a86112fafc2f0ef00c
font_02_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1