Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e8289542195f70…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 21:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57a8557300da1c476bd8fcc53a63c8a1 SHA-1: 27de3984f3cb9a9bbd5c31e24af3fd011e834767 SHA-256: a5e8289542195f706e475086104a4f09acc172abfa722e2642d19a00ff58fd1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

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://ketchas.ru/uplcv?utm_term=latest+web+series+download+sites PDF link annotation
    • https://johanbjerke.se/userfiles/file/98888607802.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/sanuvow.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jokajikadizozuso.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bde27e9f---72888537266.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dugitoz.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109140635152362.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sepaxe.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/tozalazolixegatorug.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/95877615111.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/kifuluw.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lamowekowebemifowajeb.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/3038410259.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/binimedonazulenega.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a5b42cad524f26c5b1fc1ab8fec91518/vumogo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131a49d43be6---54846059959.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/7594141350.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/93890055211.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusol.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/27768803359.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/29542576073.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wewulasufafadigi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141235880085---67310445561.pdfIn PDF document text
    • https://fasaac.org/temp/files/28217902038.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 10424 bytes
SHA-256: 4e46a8f77ee78a1b68051f08988ffc5125ba8cfe2961b5f37187c73553e1de91
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16536 bytes
SHA-256: 32951f7814f073345aac5f2c75f42f5640e1d4d3d66dcd7bb76b992682057739
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1