Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96047802cb01c96…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 11:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4af62839ca43fb4b16d5d1f4c569fd76 SHA-1: 77633a32e8ef04a2d204ae302d7659d73f8e4da0 SHA-256: e96047802cb01c966439e1be7d2ae7b0086e0545264dee6fd2947b57eb912ba2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of multiple external URIs, many pointing to compromised WordPress sites and link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614744380fbee---rasomabisudilisoluvelab.pdf In PDF document text
    • https://artistprasanna.com/userfiles/file/dawakovefigefusoxi.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/66736564830.pdfIn PDF document text
    • http://metapolar.hu/tmp/gafarurixesogenevalajede.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/61699489126.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/73073264836.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/20739380509.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c2f4e20f---28855082540.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///dinesudikusinetuzi.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jewemipoxuxutet.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d8857341---judaniwozotidaweb.pdfIn PDF document text
    • http://maksimetall.ru/files/jokesezodamudisinibale.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/44095660458.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/31607349590.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kekamede.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/migabuvumani.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/75187915696.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/915dfe2c968b3f94b0f992257cb9b1f8/98385101106.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bazuziwatobikumidow.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/sofog.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/77923515540.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66549f3f---77860974401.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/nugafoxuvilabuvaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+windows+10+32+bit+full+version+free+for+pcPDF 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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 11472 bytes
SHA-256: 2667d84681fb351932d0c2b19e3a2382a83425e135397e960f066decea87eb18
font_02_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 15440 bytes
SHA-256: ce1ed49ea911fe4ae1bd8901f2852b4598c1efe489e619a14ce967e51267fc41