Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a9dbc0db2a080a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-03 14:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00044b272664028bdabe518557fc9cc1 SHA-1: a594be20dc2ef3ad839e2f47dd2999a1f65d76e5 SHA-256: c2a9dbc0db2a080affdbeea7076527cc819031277909ca38d44c9adc0e00ee3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and contains no readable text, but the heuristic firings point to a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/797784cabead59f1467a9689749d7749/lonajabinokonufisek.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0a70c454---93826183356.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/banigi.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/28276743910.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160923b7617cc8---revan.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/13617878794.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajfbdveor2284j76vko71rqiid/58761782978.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/83j0q2ldliva0uq664qepa6nf2/giroxukodomuganikuseleba.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cbbf841b2a06f68b3728eee1108b6c6a/salatif.pdfIn PDF document text
    • https://soechi.id/userfiles/file/23192476857.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/fopelimogugan.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3b9869db---76045752097.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccc8d2189---tapimosusosakujasifaroxa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a52db1c4f---subofililiwifinabab.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be62f00bc5a---futakuzimedikogi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/86644088467.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0c6ed4c73bcfb39709dbe6c04c1b5da1/dawifajonifofokuvori.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/vakifavukijut.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3bcef5cb---pubofexegapusu.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/matopodejulojilinajakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=alidade+is+used+inPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b9140614a0ae9ecac3852e557039cf1d/63309262965.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 10004 bytes
SHA-256: c0c75bacb876c9f6afa73e84253f8b6ccd0d0a7bd9a8f452cbc0268c40572ba6
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 17508 bytes
SHA-256: 52e1d293517ed1bdcc98e5b863b45214e11d9df35d7ebcef7e444cb05d9c36d7
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 20480 bytes
SHA-256: fc6847ab79d15c572682bd7f8f3923666de8ddae9db4f4614fb5b1e964191d0f
font_04_sfnt_off00015fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDB 2804 bytes
SHA-256: b6b4b7d48547c755514426ebd65057a1789d3c26fabcd112ba1b518651d53e19

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