Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc8561d7172fb9…

MALICIOUS

PDF

88.1 KB Created: 2021-08-29 20:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c1f3b55487392c5f7fdff7ae3867b12 SHA-1: 1b7d0796473b3caf65ba9b9c2b9a8666afe91e0a SHA-256: 8ddc8561d7172fb91b38e346db204a67c13be4be64619918567adc5e50d5541f
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, a common technique used in phishing campaigns to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nepalonetours.com/userfiles/files/35883241594.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a487131d0---kebomawozepepesuzufoma.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/5426610132.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d56f1cc---20991204533.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210630_095518.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92ce140a0c333150aacc3a59ce9ca955/68399525493.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739fd6835a3---24470612930.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g0dciuioeibn4jlsu05qq7knq5/19128287935.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/53233151628.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/44c386a96050c291893a9c1ca542ddf5/49300916683.pdfIn PDF document text
    • http://flomojapan.com/upload/files/bavuturowujupulizuxade.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/wapinosijodag.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/40749422839.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/39f3425dcfeb9fa15aef8215c9aefd9f/31979116598.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gobodunavazatov.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xufofiwi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29e899df9---bebotapevapowawokotasub.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f242021555f---pabedut.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/14589647489.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393262f830---kalukifa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b00a3c866194cdca5ffb10685326bd94/98858734540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=possible+but+improbablePDF 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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 19388 bytes
SHA-256: f3a369a272544b2ac37c63c07b7886aa0ed41b96d7da6015056d3c97993cd5f5
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10548 bytes
SHA-256: c6a4c90c2fe9af7bd95d49e0cf684497beff366dc788c32d2489517257e02a68
font_02_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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