Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0832ce853eade1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 00:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 527020c39220d1d1fa00472104ad249d SHA-1: bdb682f3fbdb98dac623f2fc3d084c74553387d3 SHA-256: cd0832ce853eade128733f90d4b0313e78c591ceed80a2c2f8a23b1eafee7dd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/95071383abfe7dd04b1ef5cf7d6f35d5/bulusu.pdf In PDF document text
    • http://dragonspond.com/uploads/files/4459472232.pdfIn PDF document text
    • https://comfort8889.com/upload/files/zowerovexelazola.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/12330205745.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fuzeridajuf.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/80824513121.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a194af839ac---regixa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070953ee885f---43613425685.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/pesedaxunadevi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d5796fb7bf01992bc0b06dc7656eb057/66023355885.pdfIn PDF document text
    • http://ellev.fr/upload/files/nepima.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/masivedobojapivuxudam.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wutarugaduxefujetorop.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/88784575446.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/99476254666.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a91f482a18e75cd57a1e058da8c4770c/gubazaxikoxuxuxi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pukowivej.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491f50f264---82837185642.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/66340778975.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/e0j0vt6811lckm44ntgtuepipm/xijuzixefiduzu.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wevobibolaboruvezoril.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wifetetiradika.pdfIn PDF document text
    • http://wych123.com/upload/files/92735680354.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/89807016221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=autismo+diagnostico+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befea49834635809624d18f5a96829b6/ripokutasutiwe.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_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 10768 bytes
SHA-256: a18e02ae105136669926607e6175b3c1989f229c501f1e58514709c1b56296c5
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 17240 bytes
SHA-256: 66e0e74c3a6f026c6f051332efbef335f6ccba99a269db153236cbe5d8411531

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