Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c06ec65da86dddd…

MALICIOUS

PDF

188.6 KB Created: 2021-07-07 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f44126e812f6f25074dcefe42f642c5 SHA-1: d237419e383b424cfcc0e3b9bad7427fc1185774 SHA-256: 4c06ec65da86dddda67b514573bf4cd2ffe27bde6e68334c307aab2c2ef58967
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to potentially compromised WordPress sites. The primary malicious link, http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893d2997db8---pifura.pdf, suggests an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mumegram.com/userfiles/file/sagadakamos.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b36925e7350---78914785897.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51e36b564---70572025800.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/56302455628.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5169c5d5705ccd57a743e969f4ba0542/88600874918.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1c632aadb86419a3d9d32ade16f14dae/sugewotisidikewiropenele.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893d2997db8---pifura.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d408697d01d---xukerinazen.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/39194109465.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1edba22c0---kurafu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07e00f080---93880144987.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160886f0f93fe3---ragusogagesixuwu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/64714017015.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/4747264376.pdfIn PDF document text
    • http://mousike.it/img_ins/files/6663553491.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/livabetobusotovunumi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/foxas.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da74b46a5c---ravewuzevugivimujubufof.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/32420c9814e8751540e25c84f0afb80e/79770654391.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ka2lt3d2neotuh2o3eee28v1hr/barod.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc57025800---wikovijaru.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/peleduzexalivu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/20781399320.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/temixafedovififewuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=premature+baby+effectsPDF 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_off00028155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28155 20004 bytes
SHA-256: a9cc8a6b4131cc6affdded42d4223916a7bfd1a1a8ef26ade06eb52c16bad364
font_01_sfnt_off0002b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B4B3 10492 bytes
SHA-256: ef5ae86ae431515c6de1d5ad675aba8ba2918849405ffa0df6a80567e74615b6
font_02_sfnt_off0002ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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