Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8e66abacd4b020…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 07:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4758506746de6d704b3486c628b81732 SHA-1: 3c4d0b891f8f5faac679b68900a2d9edb8f697c9 SHA-256: bb8e66abacd4b02067885069e4e7d72d838371cac9aaa674d8af93f0a249964b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3b76ee1f3---40154577901.pdf In PDF document text
    • http://seamacros.com/upload/file/7650644802.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/jepikuzugodowaxavagiruz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994b6d1d63---99903423348.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/penajetasutoduranezepo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/kumokoj.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33a7d92f5---febevabawezamifajowisopab.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/92ed019519596f8b4c571a194fac546a/43407820175.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95766215157.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902024941816474.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe35fd5ad41268ccfb5c74ebba5143f6/rivesozinuwusomipaviwuk.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/tipesodosefagorenulukiniv.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43b977ab46adc3b781795eb4e1c768cc/64426905875.pdfIn PDF document text
    • http://casaalu.com/luutru/files/seguxanuju.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3bd7afa839c6f68ecac7f0c9e63ab5c9/12853103869.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088362e75ea4---tofinadutimakomapirafof.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/70385460638.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/pukekur.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be11edbf9a6---22211272298.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xivujebokej.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2086948399ce5a5eaec09bc041481346/93421049878.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/88419790706.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/66865ac96ec1b0d0eb46327d5dd3e5cd/tegisutume.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/28019784267.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kku6lc17a42r24iqghlpbb8dqk/42395622636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comercio+electronico+e+commerce+pdfPDF 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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 18356 bytes
SHA-256: 91f6e512f33ecbbd3a254423797c201e9f3085d45e488e17b84594f67190b69a
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 10480 bytes
SHA-256: 0d46d54a66387ca0176416f9d092bacba3c975a45ff599bfb62ac63d0cfe1b4f

Open this report in the interactive analyzer, or submit your own file for analysis.