Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c51e3e055a5932…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 13:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6154fed55c336543967c42f0ba073382 SHA-1: 6a51c0d32cc66828532728a43c8dcdec081a70e1 SHA-256: f7c51e3e055a5932c0abd6d7b47457f90145d8baa46afac6537de871208cba6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download a second-stage payload.

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 http://kammatrans.com/userfiles/files/30357642621.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/be629b3d4b0a266b93757b299a85e107/48475057813.pdf
    • http://thsport.dk/ckfinder/userfiles/files/nuxinazakomemopinogi.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b004dd7c467---tajajadovobi.pdf
    • https://bczenekar.hu/files/file/perizefivejekusivusos.pdf
    • http://urduhadith.org/survey/userfiles/files/95971981772.pdf
    • http://historia-bfured.hu/userfiles/file/9919082724.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6137f0749---nizado.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/29946116902.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/wumulegobamovasewi.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/701e09862b25f99f3fc6ea5d04dd1502/97651037652.pdf
    • http://debten.net/UserFiles/File/59047479526.pdf
    • http://nessium.net/userfiles/file/31707848161.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4e234f33---71283503720.pdf
    • http://altelaw.com/uploads/image/file/fikovebazuropamuno.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a7c401504---39033429406.pdf
    • https://clumba-indoor.ru/files/files/2512450435.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4i99k5kvpqjcka0o3fgprgb4h/tatodatugonawomepigonuk.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607884eb75a2a---pivuwikidosakevo.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/zabipakakidavakeguri.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0367d23ab3---lubufabaxajenobinepef.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/xosasulufudunizogatadelag.pdf
    • http://veraschwemmle.de/fckdata/file/rujeteziwofagu.pdf
    • http://zap-interactive.com/uploads/files/paposizasovemuvijemesezux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tautologi+dan+kontradiksi+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_off0000e4bc.bin
42353e08afc7555fefad0d702db2221c4b411574d95c9cc408e8dc76f589ab0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 17576 bytes
font_01_sfnt_off00011359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
font_02_sfnt_off00012b70.bin
e4da4bf0a13111ad5971499d546e6f7862a021c12d83ad5f98010eaa895347ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 10696 bytes