Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea75d85898dddcbd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-22 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef56f1f00926b305e816c4649d7adb65 SHA-1: c11d3dc48ce5077e534faa7d048b3ea17abbf734 SHA-256: ea75d85898dddcbd4eb1884bc53affd409fff0cbaa6ef7f841b7e99ebdb49aa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=the+100+season+7+subtitle PDF link annotation
    • https://vegan-eshop.cz/data/file/mudoveruwilunukab.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/xakefibazev.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/2427870267.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/45582255107.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914010814405920.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/potibetatapovosali.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4475ac03c---23869845287.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7515c6667f67f5c61a014bb6da63162b/tanuwojixoxerivibadubax.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/43077082410.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/daterapuzatoz.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • http://kmsenior.org/file/files/satetefopakobeko.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/58069178503.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/30500014436.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/bujufogub.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/52547067866.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/caf6d563f205163715b107917d1b31cf/72120214495.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/debewanarilesibozij.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e25a839add108cbe7a5fc07b6687bbbd/jubusixupeme.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/guvun.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354006db569---jotogawak.pdfIn PDF document text
    • https://recrut.com/files/files/33366984033.pdfIn PDF document text
    • http://devveb.net/userfiles/file/918773687.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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 10532 bytes
SHA-256: b3bc2946dbc1dd25d7fbe1c4b8bfa0649a77131c000cc95cfcc9c27e65d99d46
font_02_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 17680 bytes
SHA-256: 892c654dc759e35587d4dddd10da335e74a1b8ca4bbb0e963fdef9660dc0927c

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