Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec52ffc3009bc235…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 02:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8057549eb4a939a743badc89785417b7 SHA-1: ae0f1268adb8d601247a0618f66d16909d0f4c1a SHA-256: ec52ffc3009bc235b34298e0433b4120ac8cdefb3cffc45bbe58aedaa947a37d
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The file also contains numerous links to compromised websites, many of which host PDFs within plugin upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abe3aeacb---97479077328.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4466bdf77fbdcbef69e2bbd756df8b64/tazem.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f0504e74---29214975318.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/taeeqog69is5leue8ntc0f9fvi/lewizidesezopijesoxu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/69664008183.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/77884449915.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/migojetozezefam.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vd7hkm2rpnjj1dck0v97aa7lda/zibubevixoluminijawi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83d9e9738---setesuzujusugunimolukiv.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f639b6701---kifekixom.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f7a87fabd269a6f224855d476ac5d568/vomivamabox.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/17318732697.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0406db628cb431f3c02cf2e05bc7f87f/96412512613.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxopin.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/39069691864.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/73559406799.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbe42b6c9---84470905809.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/fozunefesawex.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/13576698141.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a929231e27a8b93791f575efc3b655eb/dojizijajoduwizibugu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/69913150136.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106181653578348097d38y8.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dc123fe5bba6ac97e629beb05d9e33b1/64037748371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=inwood+in+the+parkPDF 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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 16916 bytes
SHA-256: 8a38bd709484bf343602600e7a21283565d89a401ee459f653318add060a6d6a
font_01_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 10404 bytes
SHA-256: 116f85921a5016e1e5b85c06dcf10cd665bd1f4c0e7fc8c4fcef68c0c91a9e8f

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