Malicious PDF — malware analysis report

Static analysis result for SHA-256 9949bf29b46e4427…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 08:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54bd46606e804e05122b34ab1acfdb53 SHA-1: 22f710e2ab0ce6d84c75a41cf17d3bdb8a20095b SHA-256: 9949bf29b46e442799e6e51892e4b021f1841c322e882316c798fe2db7843125
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick users into installing malicious browser extensions or updates. The embedded URLs, many hosted on compromised WordPress sites, likely serve as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9c3cdaoso8vji69pk5m7eero8j/51957544728.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8f34982bc7b6005d8088939c65777563/75057408129.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db5896fcc---sogepiramuwabojexagulivi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b681fdeea0df21cf687a6b417bf20/sadanupovude.pdf
    • https://bucatariizidite.ro/printuri-fi/files/xadutizodi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a1dccdd3e0---figekaxaxojiwuvudime.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ec9d19f3---4811840601.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeed6010e6---69279762414.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/u7p65fh8ssj2k6cs3g16vvc99p/50207373821.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cce3e0d9ab0---37743911546.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d115094520---bixuxolusolaw.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/srjbv3dobf2lqq7o9nrih112fu/66208835810.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9282dfdbf---wogenoferatinimonox.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083d82eafbea---59904046770.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nep575635g9h7a0nu6016sdrcg/90865667348.pdf
    • http://sns.hu/_user/file/rubunu.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54923683eb---gutitomusejavezufogobigul.pdf
    • http://all-pass.com/folder/editor/file/zebuxobapuguvumukozezavar.pdf
    • https://aksukartela.com/images_upload/files/48040328330.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b774b14e---36706810032.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5bfda42d---daxadofu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+rise+of+nine+pdf+free+download
    • 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_off0000ea7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
font_01_sfnt_off00010295.bin
8ae429f9d36fa582b33f313d4da473b569b876417ef90dffe3570fb4fe3f1b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10548 bytes
font_02_sfnt_off00011a99.bin
2a634bcc439be956120e774b8f979098f356cf96c904772ac277d27f13f23be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 17208 bytes