Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc4671ab27470c3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 08:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93f3a841cc60fcedb6d450ae03805aa3 SHA-1: 5eb47a815d904417152a788232cfc62da7e92aff SHA-256: 5dc4671ab27470c370959046cd5e16a7786d0b4dc01bfd3a5989e4657377d28f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://atlantidegattico.it/file/16900977762.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/fozujobi.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/98255240139.pdfIn PDF document text
    • http://wohingltd.com/userfiles/woref.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vibopam.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/j3hj3e3344jk44q37l9abfqiv2/lojekakebinasa.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/jomov.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aaba6433---16914807943.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134514a68a13---67502383439.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/8830393027.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9f4a6f3b---torevok.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/96530839294.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161371f20f0cd3---79204796635.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/80086276436.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/palirilarikeg.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109170908294871.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gikevorekaf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390916c4413---birizetajexovojigabegegu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/15050643719.pdfIn PDF document text
    • https://siroyensao.com/upload/files/muvuzotodeto.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/67204309299.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2446512b---3439944767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=profile+page+design+android+source+codePDF 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_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 15424 bytes
SHA-256: 82f038d86fe50edba895ac75f62b6a618b98695bd7fe865e27ed7483b87459d1
font_02_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10796 bytes
SHA-256: 131cd5cb165b5cb1df371155e322bf3acf85785252814828ff4613e11468d1c2

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