Malicious PDF — malware analysis report

Static analysis result for SHA-256 118c2f8ae2eba4c1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 01:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcf199dc47926e3256eab9c969fb317d SHA-1: 452979397d8bc7c4c73cd23f3f389e434de5ff98 SHA-256: 118c2f8ae2eba4c1251fec2291a1cd5a514655027a2d26947cbafd28e19f62b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage. This suggests the primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=conditional+formatting+excel+multiple+worksheets PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6c7695c---76285564860.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a72203ac6fc95c3ea0ed5124e9d08b1/26358902885.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/sebexoxadexusaloka.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bqj1quo5pr12c9bvvr4qn7kdsv/84362930093.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/58298776185.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39b0b384e---27676040402.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210718163535_1mp9f7.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/38438874632.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/fodovivovej.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d742d256---mexovunufapimoku.pdfIn PDF document text
    • https://blokhol.com/upload/files/rokuregesokigitadotidu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6433061cb---53880388711.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68837923151.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1d601ed1---81012647543.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fokapofukikikala.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/pexanuvileruvumi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcb614971---mofilapu.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/85598865139.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/banexatopapegifuranazedix.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/23386452812.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081522421673499.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210725134922_yx9vbs.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/bureba.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/51820265314.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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 18120 bytes
SHA-256: 4e5d279a4ac8f9ee05c39e397cdfe0dd70d59d8a1523539dcebd3a53d28d5094
font_01_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 11476 bytes
SHA-256: db7034bfed7de7d3fce3f7f8dbd7297c54871c063fc7da318dcc4a327fb88284
font_02_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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