Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b988703b35545…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 12:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91a08d22386c4b172b609909e3891c37 SHA-1: 6bff4945cb53c1794b48c6f9b5ac8ed0bd55441b SHA-256: 167b988703b35545d2740ac59a829eb01cb34b9983324486ef7de5a27a05d5b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sabancilojistik.com/userfiles/file/xufodofipizinuwezaziv.pdf In PDF document text
    • https://rajatotogroup1.com/contents//files/gutolurirotebu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/99700965587.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/voxerilonumigimakoguwar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a24534e52---redodixegemebibajaluboboj.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/werepigozifinelenu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/79k8dj5bp2foucc20koerhcrl4/xosabelafifelovokid.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/setazotijenitozipa.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/zoropop.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/9163321790.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/49495197163.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/4883477961.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/73083857907.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5c75d37be7f9e9a32a81d2ccd547ba3b/4031965894.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/11894212506.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8f4cb607---9071819890.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8ada0bcf---5489538645.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48e392adab992894340abc9c698a5e8/73595523745.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/linomi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/kemepoboduxizuniwus.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210621_EEB20C170D652139.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884dde8629---27263499748.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/xovanarur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nicknames+for+your+friendsPDF 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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 17596 bytes
SHA-256: a84dbe35507e4fdd9678bc85e89f906415572fbb8abafe99c0e5433a7d60f9fb
font_01_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 10776 bytes
SHA-256: d9cdd12b1e32bf52b3173aa5c55b44349aae64d5981e0619448da847069212b6