Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655062b9f1d2b08…

MALICIOUS

PDF

97.8 KB Created: 2021-06-27 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a239f3c7f35be5c340bc2b0073ca6929 SHA-1: 4bd32db22805eeb3a1300a016047e590808342d1 SHA-256: 9655062b9f1d2b085afda6984944605c11d45479d0bc067569f6e555d2007319
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features numerous links to external URLs, many of which point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e02bde005295b5e1134eeed4a7b84766/82437628346.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/j6646ism8hkvprqcv8ru7dj0u2/fojanir.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947db306ee2---vinedu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/jodikanopanof.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/81973334736.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052657d7aa---subidasojuwozeluki.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160723e795172a---saxupusinazipu.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rapugusemupovixa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37440b63e---luvonakuwasumibaluxumojep.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b7bc48809---50747105119.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070194f5e1a9---zapagarol.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/25513814548.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/jorizurezukezipodonowixi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8ef711a2d7cb11f298296d7e0c69a913/45376948714.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08333cf1e---sobinagaviwol.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/nusumomatubiduka.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/79ecfdbef442157caa254ee89ad18568/sodisexepidinarazapoxefo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74719980066.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb2f66347---98815780075.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0017c2bf349d05875b85a13ee05ad4d4/34100659485.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demowajanufezewovapujove.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/15k9fbvttoqt1fbeb8lu4bfa8o/69127906286.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210525195440730871j32p96.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c652ef488---dukolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kernel+architecture+in+linux+pdfPDF link annotation
    • http://www.grad.math.uwaterloo.ca/~itbowman/CS746G/a1/In PDF document text
    • 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_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16032 bytes
SHA-256: 7947acb3f4ad54860d35e0df196cf9e0c9b1fa79e3914eee46271553a88cd15c
font_01_sfnt_off00014963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14963 10620 bytes
SHA-256: 5f6f7ef3c7b61dfc668d90f5cdd2b039a5746effe775a2dfd9ecfeff50206875
font_02_sfnt_off00016192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1