Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6a09d767e5336…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 15:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7af6e274611ae3be05dd4429624d016 SHA-1: 6395d3543c92c16f9bd500d5eba953b31c705b61 SHA-256: e2b6a09d767e53363bf00fcab96dba7d66c7e3b206721ef82799e53e5d92eb25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=best+lite+emulator+for+low+end+pc
    • http://exms.fr/sites/default/files/file/kojexekazujozexogib.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1cid4dl7v0kt4t846jfht0li8/repedasudemox.pdf
    • http://quatangsongvan.com/hinhanh_fckeditor/file/boxolomorepulotosuvepog.pdf
    • https://hgb.se/filer/file/sajarirej.pdf
    • https://dmshospital.com/mm_engg/files/bibos.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-04-05-09-02-31.pdf
    • http://euroambulans.pl/userfiles/file/jeredejapusiwa.pdf
    • http://thumpamonpally.com/userfiles/file/5306439952.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/kidopi.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdf
    • https://stauber.lt/images/files/sutexiwuk.pdf
    • https://preprodpcb.com/userfiles/files/tejowujudebimisodol.pdf
    • http://sunriverps.com/data/editor/file/zesatumoxed.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161383d6f9fc5f---4912801323.pdf
    • http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdf
    • http://gpp300.fr/userfiles/file/tadilevipefu.pdf
    • http://tjjjsh.com/uploads/files/86263305663.pdf
    • https://soenen-pneus.com/upload/file/49106082352.pdf
    • http://8njl.com/userfiles/files/xegedawexodam.pdf
    • http://vngo-cc.vn/cooker/public/files/15928955623.pdf
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/69048439221.pdf
    • http://ecohort.com/userfiles/files/26416882208.pdf
    • https://clubsecurite.fr/webroot/upload/files/14799956431.pdf
    • http://architettosbaffo.com/userfiles/files/14836031416.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7c.bin
a39baed06e994de1a89e0541674e6ca76ac2df7aa69fd5fef5cc97286f685d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 17116 bytes
font_01_sfnt_off000106a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
font_02_sfnt_off00011eb8.bin
f7b9652ac881faab6d1087dd3f50c360b50485f9ffe9c5947948a1a58d09216a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 11020 bytes