Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7798a0db58d2ec…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8097b847b7b51ef4714861445c1db9fb SHA-1: 8ab41ffff842b726369460c4eb6d0fdd1ff30d2d SHA-256: 6a7798a0db58d2ecdea2d863707795582b56f8eebf0b0e7e5326ec687472cc60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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 https://smidgel.ru/uplcv?utm_term=ui+designer+interview+questions+and+answers+for+experienced+pdf PDF link annotation
    • https://okazdedziecko.pl/_files/Media/file/revowefamixexegepe.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2107271609227872511s5gt3occv98.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/69992541256.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/90033tabketvmbvpng0n1qe3k2/71909098481.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/38feeb856107de0a8be319cd08502142/fenapimuz.pdfIn PDF document text
    • http://baove247.org/upload/files/voxowu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/15431593019.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/vowinagarisugulogatefani.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/83711406838.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/34724291770.pdfIn PDF document text
    • https://t2sc.me/userfiles/82949362053.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cb86ff98---96105867072.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/lajidefaxanaru.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/48531725883.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085044c27ace---24568438764.pdfIn PDF document text
    • http://envigest.cz/upload/file/69701743660.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/25774907684.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16111a4d8eac57---walirubuzir.pdfIn PDF document text
    • http://jp-cable.com/d/files/29294511441.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/65990021517.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57140359668.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/95992cbacd186f9f16d82ca04af2ff9f/zerene.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 17776 bytes
SHA-256: 03417e46b617f5cfd483e69a4a763c495ea2bcd023288ca37f53ec6d3dba84a6
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 11256 bytes
SHA-256: 4a2785b55bb405bf61d39d76cb9ac0b30ac7aba33f5b40f3055809121b336f37

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