Malicious PDF — malware analysis report

Static analysis result for SHA-256 a311051ec26c14ca…

MALICIOUS

PDF

81.0 KB Created: 2021-08-08 18:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1f3b4e913b5cdaa9218e3b509b8b23b SHA-1: 716109a901586937a91b7a13d5bcd7347b7dd13f SHA-256: a311051ec26c14ca0946ebfa6d516ec88da2fa7d3a224b237bb075fd57fc0269
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs that point to compromised WordPress sites and other disposable hosting, forming a link farm. These links likely lead to the download of further malicious payloads, consistent with a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://portalkucharski.pl/app/webroot/media/files/zopalusenuxudeg.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/dbe87fa9a51daff75f4792a6ea69cc45/45016710700.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/26340358530.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/30159850324.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160823562b09fc---95602562191.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiboz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210521182142975.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mesenufupilelepiranokem.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/teborafij.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/bokexavemovibenawibo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1f650dfc---voturatepuweriremi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608478504df21---rubepi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/39759998178.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609048c89649e---4405895700.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/39016135797.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/70847073078.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac819b8c1fd18a39c06105911f7aa8a4/pefatijojozidozit.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b602baa8c---tafosokoropisure.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/358a15d1b97f7d86857f8baf12d30aae/83975221223.pdfIn PDF document text
    • https://medtek.vn/storage/file/36644816951.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210728_40DA46FD0ADCA658.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c47cca57baf---vidofomulativeduvej.pdfPDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca02b11a79---92810177212.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///24404730215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=descargar+bluestacks+2+por+uptodownPDF 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_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 18948 bytes
SHA-256: 16b4931f0fb3e2a62f807875c6f2f2284356f58ab5b434d7b76ca1ca728b895e
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 11136 bytes
SHA-256: 5aedef1c5b2a4a523b86c6d9e6612f425eadcee7877f9dab60af70371b8578af
font_02_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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