Malicious PDF — malware analysis report

Static analysis result for SHA-256 13555722eae5c637…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 17:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9f51689e097f047a1e59d472e24f0f7 SHA-1: 593dab0fdccb262aeb8db2e72c45c4697dbd36e2 SHA-256: 13555722eae5c637f067bb85e3c7150d16c9132695e028d6c74d160b84174757
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alexlunacoach.com/img/editor/file/4782511878.pdf In PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/1650353453.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/sivabo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/boratizokiderizepusigaxa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/df6bc7c48c220962ea15de293148531c/48738180715.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/41252878966.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/91753079874.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/378f6507ee23f8645215eaf291bfb05e/81343714985.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/13883718691.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/benaduvevowufu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zadonizitakiw.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/voxofefuwuruwegotami.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jogibanofufo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/piwesewowuselavid.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/87044691697.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/05arbjcdv24p9ton0lqbghcici/lewumoxoguxutojapilixunab.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109102158403424.pdfIn PDF document text
    • http://erictex.com/ufiles/files/duvitasunevixugivabafif.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/metekopuzozojazi.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/63779571989.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161427be40c71d---xinovogus.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/26136562384.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/salomepoxiwewebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chromebook+emulator+android+studioPDF 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 10876 bytes
SHA-256: cb98519cc277f76e9f0b6223f21fe25f7f272c17e117c6faf5a2542b7da34b54
font_02_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18360 bytes
SHA-256: 308a0c2240e5d1616c28f5a20c49d0e520d3ff92ab3162be0aa156077992ba6d

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