Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c304977125ca7e8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 10:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdc2635dd484b6e15240c43149848680 SHA-1: 92b855acee9d5832a4e44dabc0707432c7471c5a SHA-256: 6c304977125ca7e833e0162f69a338368045cb106ee59e475925eda77cb4d3c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3deb73212d538ad133d045f2c42888a9/levoxowogokagavaxute.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836563fb58---ginikopavej.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/xikimivogibeg.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfda38ec5c---67865056005.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/gifaverobus.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9u63hrhm5kq31nr28gtra75p08/82260595294.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d6c6622e---12648001387.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/11851579805.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61b65d025---dugiranavojiw.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tebuxodaxexiweserolo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b953187a---murikovalomatelasiwativiw.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/zejelapogafu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/58647303061.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/doduxapuwegiwizovidodujol.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/bupomafezunes.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0251701e3cfab574eb5892991b897990/45139028829.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c24a0e0e5---18133798278.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kavikanajum.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/nexadunavadorogiteg.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26a9ac451---97137221253.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/tinedeloxexo.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/dewexataxivifekedika.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210504055652.pdfIn PDF document text
    • https://fond.ru/userfiles/file/ralabebiwozazivolewudis.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/dofefuvikogef.pdfIn PDF document text
    • http://expresskaliski.info/file/vitarigefimidupaxubaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=history+and+theologyPDF 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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 10632 bytes
SHA-256: 85f7ad069aafb2b57c8e3a7cb357756c1d9d2e42f24f6c95311e173d97891fdc
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16312 bytes
SHA-256: 0f5b8ca6c18a6338ec6e8acb1830ae03c41c31f26b18a969a8da95d2bfb6055f

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