Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dd08ddfbcee71b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 06:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88f6b6ab5ca1f540dd1522b128233cec SHA-1: 237e9c610a6846315e9af9ef121eb6c2cf91eb22 SHA-256: 14dd08ddfbcee71b6ffdd1f56ffeb96df22b71e6df38aa9523fb897d672f6a75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=white+punks+on+dope+song PDF link annotation
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5fb6a3949d61b14a8226db41678e8139/mawuwowo.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/40931591541.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/1e506415178776f6b3a2a16a014304b4/perupexigo.pdfIn PDF document text
    • http://xfswchem.com/upload/files/ferinovuwuzozejirige.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a00734eb0---96742424637.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/80928983967.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lemenopuretuzukazogur.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f210f9ac0b---12778077315.pdfIn PDF document text
    • http://storemisr.com/uploads/files/48346439372.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdd964d3f---59088672035.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b80aad734fd---farigifewavokikoziwuzo.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/52091476476.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2c9c924b---wudipomonuvamiwejuragejuf.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f837a030d4---kelasedadalusoda.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/70676815699.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5368d0df---milonofime.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac5c71821---pafunazepukaku.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/motigokima.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/92563726422.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pegilupujexuvuraj.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/putoponaxisadepexijiz.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/53155354338.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611937d8f4210---65302013708.pdfIn PDF document text
    • 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_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 18296 bytes
SHA-256: 23cc8ff9b21c22ad6f307f8f1b0e305ee40b6a45d65206dcd7dfecbada440a88
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10548 bytes
SHA-256: 9beac52e90e45a6ebdb737f1f2c26afa979f8b2da0fafbfaf42a0cd715b57603

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