Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e97011ab1d81b9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 01:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fbd936523a6398ffe9dcea4b5598255 SHA-1: d505380443d10fd6ab00a183f0fd4ae715c78432 SHA-256: a3e97011ab1d81b992fa27404633cefcab3d4800e84fa6c15df94848bffdc2c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://oniceh.ru/uplcv?utm_term=math+fractions+adding+and+subtracting+worksheets PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084785acaa76---xuzanere.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/afbdad6d69d257cfaf969ad755dd2e2d/ripaxagajazaxigos.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/mubawumiwer.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9fa56da6d53c26ab06c6d282e805a8b9/kerazisigunuwafo.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/rozugenuzuki.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/mukubulejivikopurew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449ba8d6e---didilode.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf7521187---madetobok.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/16505146674.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g42g7hi9n2egni1s21ud4bvpcs/4519325319.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab0d42b28bea81c0a06bb26a1a887fcf/bivizezodedomowe.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/89931681013.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6a5bb648---fojisutemixilurupu.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/nezesudemaweriwapefupexef.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/95748493245.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd4234c95---36969030957.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/dutegaxobuwapidom.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbba200b6d---56095342171.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/88145020087.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/mubazogidobisilo.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/4302486641.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be83e67e42---50838506361.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608566c787731---fazevijetugetezuritepoxok.pdfIn PDF document text
    • https://ccskin.com/geektic/files/85428895633.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9e976d3a2eb8c80e9e558dec7cd63712/febovuvapitiz.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_off0000bd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1F 16972 bytes
SHA-256: a82664946821c101e5d0334f78549545f9e2b278771fd27a0ae1e57881c5e534
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 11120 bytes
SHA-256: 7bfb4e4f46d4ebd81022812f418421b5359b8c3890d7bafbf38e7be48a6c8f04
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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