Malicious PDF — malware analysis report

Static analysis result for SHA-256 111b517c0736d8ac…

MALICIOUS

PDF

77.0 KB Created: 2021-07-18 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 439e0feea82e6f13a1c6247e77c3e856 SHA-1: e23917588d7378bf474463ceebaafad6a5798ddd SHA-256: 111b517c0736d8aca540820786b6e425fa0f592bc436b0fb30d84e12a6495452
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of embedded JavaScript suggests an attempt to execute code, likely to download and run a second-stage payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dnmpaint.com/sdcc/images/file/53961214765.pdf In PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nefuboladug.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/85674287318.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1a7ee7b2---fadanodu.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/17897550340.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/65811452564.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6d15fb14645d19ed63f9165f795e45c5/polifasetenofamuteraduwut.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32d674acc---82993516645.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kuniliketebetelem.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/felumoku.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4sgclaimeqh6hiu6hvhp72pq8l/10910957853.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f5db7e0a---24004930689.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25c4c6cb2---26355598453.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a127de78---12214155116.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/xezinekuko.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a3a16d8b---94866501824.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c08db690---73442248029.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/60530952575.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/gaxesi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357cb8a257---65304902768.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210607_46665373B9A68AF6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=solutions+class+12+chemistry+neet+questionsPDF 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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 16864 bytes
SHA-256: d621ffb277138c6f3f8726a70732c1c7ba5067ee7caee71eafc164af03a0d0fb
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 11104 bytes
SHA-256: 48cb4bbe21eaf8ecb85b8cb5bd9855589482e46b3c3657599831a48ae0fcaf06