Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6c74ad4c034cc3…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 07:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b3589dd2da58b76655ea3cc2aee4ce63 SHA-1: faa709cab87a34b777b3915da968c58e7409d2a1 SHA-256: 0e6c74ad4c034cc3b92c5e20e2f7fe237cc8abe8c7c078c5e3c8f429ace41650
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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 https://ketchas.ru/uplcv?utm_term=business+mathematics+and+statistics+bba+1st+year PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fd4bd5f7---sigebajapibizezubigo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f519db5f31e635566714146bad3d2eb5/mafosisopilixifat.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/69249408727.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/9540106604.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/f982952cf3337e7a9ee252004b65aa29/5517270892.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ffbf5nf9b3jskr0ft6jf2ehbk5/dajavenisu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c27968929adceb7f0398708dfa619f46/xenevi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c6b3f667---62889572097.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/xademefu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/194haudkard348i98atqfsjtq2/baxaganezozinukopivawev.pdfIn PDF document text
    • http://askaudit.ru/price/nifukewituvotevakogodizug.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/60665931197.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kejejemunafa.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/23187003695.pdfIn PDF document text
    • http://klpa.net/userData/board/file/puxifopilixoxifexukawosuz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790aa66d6e2---26311143465.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289caec2d8---viwesajumepibato.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vajazigepisiferejimeti.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cd7b38fe---25278514924.pdfPDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078148f27b0d---29588842530.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/77803041081.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ism0f1l5knce3shjtpfmksj6ch/sitozijigufife.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ca95fe7a69827d102d696e70d1568699/75508654845.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_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10928 bytes
SHA-256: e33ae65171b731ecd2c7bc12173a435da13d78ad9777446d2e8ad8765b93c377
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 17336 bytes
SHA-256: fdb9ca56686b8f8112ed804a7cccc7550c4da67a2467c5ef2dc480777626925c
font_02_sfnt_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1