Malicious PDF — malware analysis report

Static analysis result for SHA-256 9413fbcd077570e9…

MALICIOUS

PDF

109.5 KB Created: 2021-09-02 10:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 930e707b631dbd39789587d863be7f72 SHA-1: a332810e525dbb643258ac412ac662334999caa3 SHA-256: 9413fbcd077570e9ee62df6ca1d09a700e27820479de743cf426945be50ef71a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to multiple compromised websites. These sites are likely used for phishing or to serve further malicious content, aligning with common tactics for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crysiq.ru/uplcv?utm_term=order+of+reaction+in+chemical+kinetics PDF link annotation
    • http://automotiveenergy.cz/userfiles/file/gegorabaxilosotipoziwe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b9544ff0---futujide.pdfIn PDF document text
    • https://egf.tw/test2/images/file/gejilijuw.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76a30f125---84973913001.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/82272220095.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/kapipemuvosisalorafo.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/dilovil.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/wolopasunadezilawavedimol.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-20/20210820102335852875.pdfIn PDF document text
    • http://teakdeck.pl/files/file/59823574338.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c536c3bed98---givotenopokepimemut.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/75472373845.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/rezomida.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9691cb66---toxozuvadak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caac2333edafe4fd8666b571c26412ba/topizaxopozul.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/4150101229.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb327f5db---ruripokukef.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/lukavo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf60d01dfe---kefum.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/63790928053.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160835f23b03db---95330150233.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zejoporimurotivob.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f139ceecfd6---fifedugekamik.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_off000140c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C7 20244 bytes
SHA-256: c8dee56a52d33dd1852ad0a14a27288a207411d798f0f133fe7d011ff33d0d6e
font_01_sfnt_off0001769e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769E 10860 bytes
SHA-256: b2fd43fe3a2a81f2c534852b12818927e419c5b14b45f488627befc7b8cf16bd
font_02_sfnt_off00018f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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