Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71b9feed615ba58…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 07:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 432a1faed174f26c07ff0341abfc112d SHA-1: 19d8e079f82e1871fdcde26d06be4087d3eb978d SHA-256: c71b9feed615ba581c01b65732a165c9a90e253de49f7548447ed901cf0998b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of an IP address literal in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c81ecc546---18310297945.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204c9b2e3d---degefimag.pdfIn PDF document text
    • https://pmms-online.com/assets/file/vavujusosu.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/91972412019.pdfIn PDF document text
    • http://packturf.fr/files/76339287257.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/77493078861.pdfPDF link annotation
    • http://randalljroutson.com/clients/44711/File/malojijezuxesunenor.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34f38a4ea---xiguni.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/945ff9a32c2d9835c032e25fe7c8c534/robalorafafukos.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/bosasawa.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/91272576954.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b9e96ce32cbb1530737fd5d210bf5d09/kutuve.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69607087817.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16234316551198.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xuninevajezufuzox.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/natcdc7ilftbi216egr5q84iol/21078583050.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wuwepuzefidorumezu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/31577516230.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/79555265783.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lebizedotekeduvoxojofo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/f28h0e45etvodb4nk4strs4dus/xijelisomi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/rusimeb.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/3182727119.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/19137462076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=meaning+of+inferior+in+englishPDF 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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 10388 bytes
SHA-256: d727d7fbdf2098b7f9ba69d1ee2ae647f169707cafae54467ae57741a22a10f5
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 19988 bytes
SHA-256: efdd53fc40ba8150ad4a01bf977c7f7a9243b8674bc17083b358e1bfa905372b

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