Malicious PDF — malware analysis report

Static analysis result for SHA-256 921b8d1fd5d61f8b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 08:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8792b5559b4a5f860c1cf68dab4e8aa2 SHA-1: 94ebf8703b160c8ee5d9a72b5ded37510c3cfb3b SHA-256: 921b8d1fd5d61f8b5962f7d50ce45a2a71e4f986a5b092d466e727f358d23972
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fiscconsulting.com/userfiles/file/15197679837.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/kagamonalu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0092d9290---26547507144.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/vamekodafesub.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/lamototezolap.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/muvasokuxusuxewavivekeri.pdfIn PDF document text
    • http://benhgout.net/uploads/Files/file/norowutoxigekizaniro.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130405ff0ba7---sofiwomi.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/kavopojurogojonu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/602d895c1aed06b99cdfba431e73a076/66681446975.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/75340370385.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/runun.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/80584242433.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e9277e180---xitojetujebexofe.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/giligiro.pdfIn PDF document text
    • http://houselandia.ru/files/37229671889.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9074072485.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/94045024618.pdfIn PDF document text
    • https://podimercrm.com/img/files/mupawalijemuwobokasixe.pdfIn PDF document text
    • https://loyd.rs/images/file/60597369253.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614245a91ee44---88047074058.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/36909506669.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zalitedem.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/89951405851.pdfIn PDF document text
    • https://atlantidegattico.it/file/jowotezafuvexogakase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+erase+sd+card+on+phonePDF 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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 10548 bytes
SHA-256: 5d9ee269b9601da9e32700dc4070faefa3bdab11d79b2a999ce8570a3bf5147d
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 14408 bytes
SHA-256: ae9d2675a8255893e557a1ee77efd11068d740f554eb67af986577209b553ea3
font_02_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1