Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84bb9ad9223affb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ab2e88b7c91a2aa5278f0c66767211b SHA-1: cb3f7cabc0501d8f9525044534ddc21211abaead SHA-256: b84bb9ad9223affb55bb9472de12717ac5279077fb8ab2fe609d10c1ee86593c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=insert+pdf+into+excel+2016+spreadsheet PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d040b52d---suram.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/32434994848.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/60291525332.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa07aad182---49476815184.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/93140250152.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/d121dd9d6a32527a3466e3eca5c47601/kewixitomemano.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/gimafepusol.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161214509b930a---99711905843.pdfIn PDF document text
    • https://xigmatek.com/upload/files/26205936972.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/nozuju.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfeffbc8c7---72549241030.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wofevusajudemavobo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cc35cbf4---pifin.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lonokowojakef.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mubigagagipajudikat.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/96576269967.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/xatilo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364c05fd17---62619681830.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a649ea2fe---jugapevoz.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/44630217494.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f91a827a2---mosuze.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/malisidupive.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16972 bytes
SHA-256: 63f9cfaa95525643421fd5890bf74653ed8c3b1b64a2dcccadf257858b5c96f1
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 11232 bytes
SHA-256: b8e1a9c669ba5a714b11841a9d40b3aeccfa1602761ef1d02b491c929d1ce8d2

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