Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae9ada0b29132dd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 20:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bac960bae2199aca6b1a0658be760de4 SHA-1: 5dfa89f923db1d785d745ed53c3441fd9daa83dd SHA-256: eae9ada0b29132dd2da0340608d83af4eea9c6fe8c0109de5f67d4c6a80d9194
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, 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 patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://51-lq.com/userfiles/file///74565430877.pdf In PDF document text
    • http://sadiqandsons.com/userfiles/files/rikiketofonudavamejapexi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb8fd6b288---duneredikinagekazoneno.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/ruridebo.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/1774622767.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/45001564924.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c07a082d274160d46dc8b7e72a6a8056/fewuwikize.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/wekivikaraxopote.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/loledudurasetedodufi.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/52290873433.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab125ecb4---35723763943.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864de47c97b---nifux.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/50cpfa5e5sn6pijg0o0eupvanl/60901087201.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/biraguzerapelimog.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a427dc9855c---34023161558.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vuxutexogajodavekizirarot.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0a860ea6ed3bea7cdce9c3fab9e689c8/23200232564.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/45902815283.pdfIn PDF document text
    • http://fitviewer.biz/files/file/29732180722.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/mumitojadirilizev.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/85466219867.pdfIn PDF document text
    • http://praguetransfer.com/files/file/22717861117.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/titaxiturufakasemineje.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vomatim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kontenplan+rechnungswesen+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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 18332 bytes
SHA-256: 35ff51f89ea9b949362313b3d8991827b021befa465f7f581db364f36a3baf94
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 10984 bytes
SHA-256: f5c5f320455f3ebf8c00328a4fea90f5cccafb0351e366981e7acc658d8fd64c

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