Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab21ddae1cb7a3f…

MALICIOUS

PDF

98.8 KB Created: 2021-06-26 06:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 776f947cbc0f6ec7b8a3b804826cc0bd SHA-1: 428f0d611b92ed85c87c6c2e55d4e2f198f6eb1e SHA-256: fab21ddae1cb7a3f6fbbb266745f83af544f11b473fc542629fbdac211df62e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF acts as a link farm, pointing to numerous distinct hosts, many of which are compromised WordPress sites. This suggests an attempt to distribute phishing content or malware through a network of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://capitaloffice.pl/fotki/file/68441150621.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/625c4a3fa06c68be7b638cb5ef3b3432/vukitam.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/594bdb366486ae8ef5ba33275814bff4/97259474752.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/18933123924.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ldrjtgheum3nou3q0b8m8v0jmd/nepof.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16222529733396.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e6026b46---jujanas.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pape6sam3u7rir1qqn54q45uhg/ropepamakosavadax.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/66245656240.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/65e51e70a7d5658223451dc50b52afc9/lowofezesi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/fekosabejig.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0d588943---rawasobigul.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vudukarabexexolujemevad.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/212aa99d162c9e840ca009b3dadc42f4/papabegegunepogaribefosub.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bb169596---65381575231.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4874eae7---7115380574.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098505166b08---nolaseliduloloxidu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/dosef.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/arnhv0e829uk8kugpuiclt15uf/94928017691.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/18466792450.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2hco4pajig1gv04sumhl0nk0k2/kafomev.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/45617516755.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/26789124811.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa59b5cbe---39633336262.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7bfdf895---kilumejobita.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/pedafo.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/7165759475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sections+of+the+duodenumPDF 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_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 10608 bytes
SHA-256: 713621951638a083254a8ba409775efe70351b242cd01c1b578413a98153ae01
font_01_sfnt_off00013c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547F 16072 bytes
SHA-256: 448440980f93c4538beba62f85003aaed6427fc3e596dcd5c39c301e40c34f75

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