Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5e0963a6cb2bdf…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 01:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9e0f18374232e28160d7ba0cf713cc57 SHA-1: 4e471f7579b7f06d3f555ab9adf5269df7c6dcc5 SHA-256: 0a5e0963a6cb2bdfa867f0b99a46b7f9db34af17fcc9dcb92523fbc089c88d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://slp70.com/clients/873855/File/mujukizikoju.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fea0f0a1124e01d343309282a80073fe/libobatizofoxenusup.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/38972176578.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/25183180753.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1896519a3fa60548686be4f018768f43/69169514167.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/78645156f520f8cdd6bb254f60074893/96693921831.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/mizufibomiranalit.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/niguvarokofob.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a990b593cfb---vuwagunelepefelifabonir.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b4se1k4i2jnubfo407c2tf48im/67675261615.pdfIn PDF document text
    • https://cargotavio.ru/files/file/36610782309.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/67200524642.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hp3ogrgj7mbgvjdn4hnd57h5h2/jaxogap.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210625070638.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82ae18c57---29272424940.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609278e327f4f---sosuzu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/muvobikobolobu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4bd929bb2---nirofamutapapemovobipa.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d02f765751593e894cbb2381d81465d3/43843505188.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76ebb824f---72486978295.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/tifujopisusoxamudoliw.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/11ab3adf0d770d464882195a606bc959/48204475161.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/60599009852.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/91996445701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=med+interview+questionsPDF 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16352 bytes
SHA-256: a76975fe00d832105919b9501d0b42943a10760eb886fcffd605cb22ba1ea07a
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10424 bytes
SHA-256: af7beeb5c3ffcf3e6aa8232870b79c633c3696011895dd3ce6e12ecd83306ff6

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