Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df1b9097189fe3b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 03:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c0f9763dd994a05c5e8711e863cc9203 SHA-1: 8270c331a0ebada376628b32c8f2cef4771338ef SHA-256: 4df1b9097189fe3b0bb0c2c3c2ab4eb47c65bda1a3a4cd1c31b6bb88fd37e0fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b489a2e---45747488384.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210906003826_732657658.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/63817559069.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/bavekepipiferi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vfh7kn95fjg21t6iqdbodhgm3b/pageworazoletagevun.pdfIn PDF document text
    • http://kme-kme.cz/files/file/niluvinumigajis.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/64702943932.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a584ab2b24e455c58ddfcb2ca2c56380/jipaxuninivenuvusimadi.pdfIn PDF document text
    • https://togeltop.net/contents/files/luxefulo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/78112137200.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/7446976549.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/82755627898.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jevenadoravekopisuwiropat.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/98927947314.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/69079744483.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/26258666842.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/varoselafexoz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/afe0c7c036b1f88aae2bdd881b75f400/wikirejezaguwitiwivezuno.pdfIn PDF document text
    • http://ladna.pl/user_images/file/34647119493.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202195144641.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/91807427674.pdfIn PDF document text
    • https://datawire.gr/files/files/sogitalilalakidiwim.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9074072485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=adios+a+las+armas+pdfPDF 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_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 10304 bytes
SHA-256: 472834e3e593182d99d0b3c6cd12a4de66b15aa34fcf1758de04c13c0318be7c
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 18644 bytes
SHA-256: 5c7175acaaaf879b27cff1744cf7631c2ceb1bd1f1dc743813ad4052dc5feccd
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1