Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89ec72e57010bd9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 07:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ed288322ed2fb08677659498242d3f4 SHA-1: b692e1d29ff0e5cd3786ef8b0f30611ddd18385b SHA-256: d89ec72e57010bd94915dfba78d6bff7d69764de7cfa5f63bc5e591813157e46
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis reveals it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These links, such as 'https://pistant.ru/uplcv?utm_term=samsung+themes+apk+latest+version', are likely designed to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=samsung+themes+apk+latest+version PDF link annotation
    • http://savvyais.com/userfiles/file/41642464444.pdfIn PDF document text
    • https://seger.cz/userfiles/file/jimatisadiradokodibuji.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/37117388514.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614083e49ecf5---67065620585.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/taguderojevokujipiwekexaf.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/somewunijujitanab.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/37180649822.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/63412480420.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jadutinuxe.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36594941905.pdfIn PDF document text
    • https://virker-ikke.dk/files/46399488278.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/28894835969.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/32644546656.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/finugob.pdfIn PDF document text
    • http://yjccnc.com/upload/files/28411806152.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/99226929430.pdfIn PDF document text
    • https://o-dance.com/upload/files/logevo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/xagikupejamavovajutaximu.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/sajabebokodidifojenedi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390dcb206c8---11592554866.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/57253262761.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc8b6a1c3e5406daddc9b904cbf9dfbb/80071348708.pdfIn PDF document text
    • https://avela.md/userfiles/file/94135473266.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/45103198723.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/48072867383.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 17416 bytes
SHA-256: 8d25d527795e5457944310f6bd4975e18fb51cbceaa8388454e8fc689eae9f61
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 11032 bytes
SHA-256: 6bc27fc1936e43d0155079b3af8d777d547f31b1ba8ffd90d6d9470f697aaa29

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