Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde3c5659796225…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 15:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7282804eeb85a5bb4ade62f386e1be54 SHA-1: 0987bc28ed51e27c9bdd6f1c978dcb80db51cec9 SHA-256: fcde3c565979622583cfd4c3187c64fd36c3b29da2298810b8fdeadc9e9eb3d5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nomylo.ru/uplcv?utm_term=android+rom+for+old+tablet PDF link annotation
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/rapepi.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lananowugo.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/7582493180.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/89712884347.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/65959059625.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/40722642695.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/tugebemojonesoxeletotigal.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///18664580859.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/dolaxobawolusumefafazo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/90996466586.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kufakexukaravebiwil.pdfIn PDF document text
    • http://kag.fr/userfiles/file/vumorujap.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/mirumu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/60624738890.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444e6807c8c---wurewijezefizatebozurir.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210911065023_1961796314.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a11d4c9---zojev.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/10049380438.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/53557429457.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/73918672137.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vqe0sc5746unijt7ufbcnhoqm6/7312010177.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/pevug.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jesigapamosogos.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/740e1bcb4b55b0f9cbc93d95c0c87239/16682643805.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10468 bytes
SHA-256: 5e988617d77ddecffc918d79aebfc2b7fb765fa4b1cf0317ba21ba3b666537d3
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 17616 bytes
SHA-256: a472bff84442f81457431f66878b06c904cb044aa96b35970c3a12e3c3788433
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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