Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e5551d4e15bec8…

MALICIOUS

PDF

109.4 KB Created: 2021-07-03 03:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55beda9f0138a799153d7bbd655a6a21 SHA-1: e2a2f47c5a90519ba01b9ebf787784c70bc4b22f SHA-256: 74e5551d4e15bec8af9320fbc9c9282831c4aeece2d4f34e4c5a3416e82fdabc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress uploads and disposable hosting sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pamat.ro/UserFiles/file/84713986244.pdf In PDF document text
    • https://lescourailleurs.com/upload/editor/file/6224574483.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0g18co05dnov6bprn3nkvicpap/13381608779.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b31577f95f37302d0c4c8e5425034b22/32335138201.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/aa52a258339eea6f3452d69df4697ad8/korarareses.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4321b66ad1e18ad46dda21f37b16affe/padidivogobuzibetefutedu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f66a13ad4---99947472989.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/lilobonupe.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kumiluluxilazikuwusedudo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4cd0724e---21725903509.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/271697c0835f7fc1b31ee5d55288abf7/31221998197.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3b9e78d1---mujalugogelosigexosafife.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tovosili.pdfIn PDF document text
    • https://birotex.rs/images/files/wowemudumelazin.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wisepoxavanabotukixodil.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/1437b21b5913d58789c685b2e0718179/60571892345.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8107adc17---vurafefowubu.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/suwokujogixabaniwil.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6t7emeseg8iku38p6tc0v6f45h/nesugironabexalebe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sufez.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f83c30ae---18792649061.pdfIn PDF document text
    • http://armanetti.com/images/56940589992.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591f11649b---koxajixelitusadel.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/dn9ncj2kllkce5r09ur7mhdoik/59082790435.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/7341762151.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/57148486607.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5fa9ff9c---midukideloxojemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=c%23+collection+initializerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 928 bytes
SHA-256: 3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16984 bytes
SHA-256: fa133159517f2a6d0f2f6931ee77b5db1d69995af6ad61ccf6e639b7a049a06b
font_03_sfnt_off000149b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B5 31476 bytes
SHA-256: 399a8043927aa47f9450b6a4f9b5d48ec293d5f0e7980eb3c41a0b0a1715cba7
font_04_sfnt_off000194bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194BF 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804

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