Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cf6b506e3dd960…

MALICIOUS

PDF

83.2 KB Created: 2021-07-08 12:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d320d2ef5d09e98f7fe5b39aa0457a SHA-1: 4a94db3b4782913b56438d1ca5dcebfd2d3340c5 SHA-256: 45cf6b506e3dd960372b6816454f89ad4e3ed90f1e103f650626d53ecb227417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026d6034b6---9438864330.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/rotase.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805a7b5838b---dumunurojir.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077ead19788c---najojekenepigopa.pdf
    • http://harrisonfamilyreunion.org/clients/868801/File/gaximowoziw.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/57002180597.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b04839e1d---tabamusapufibilijogom.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d8e34412249725bc8d81cf7000d3166a/55671258482.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28493b5db2---menomudem.pdf
    • http://rayanchem.com/d/files/tetiribujubonerakufopuja.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b54254c0e2f---xobiwarov.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7201c4648cc94dfbb470e142fd1214e9/wanaralukeluwobimoropol.pdf
    • http://babamoleskine.com/files/file/59148110657.pdf
    • http://shahnawazonline.com/uploads/files/93391814651.pdf
    • http://chemonova.com/FCKeditor/file/xavedud.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6c80cfe2---witikesomudivutajikape.pdf
    • https://samarpanbharat.org/trila/userfiles/file/jajulowupawuwabolagudilij.pdf
    • http://asianmosaicnyc.com/userfiles/file/batepitotager.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f7f2de5bfe1b2084536da20dedee6b8/lotixofavej.pdf
    • http://derkwoo.com/upload/editor/files/xevigivegedatubobuz.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea1e01a06---59851323504.pdf
    • http://ngor2-3.com/file_media/file_image/file/84710137198.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stock+inventory+excel+template
    • 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_off0000e36d.bin
57d449dc8665e2ae1ed343ab6308faa3418e0f85655a45d5b57088d284974492
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 10816 bytes
font_01_sfnt_off0000fc75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
font_02_sfnt_off00011487.bin
e76d039fb2af63211e3bbc6a9062c2602e6ecd9316b4a650e4502d2d7ef455bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 16644 bytes