Malicious PDF — malware analysis report

Static analysis result for SHA-256 c549303249408be5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 23:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6edaf0a1675c5c5c01041fb5325df3ff SHA-1: 1f9b2aca9e332a00c127a51fe4e758b70f87a8cf SHA-256: c549303249408be590dbb1bbd5371c9b92801fad78c74de42bb23386b4e03165
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/51263628908.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5591c94d---76135201592.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/delowizogerupesulixisujem.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/853b9451b7bd30678777a1cb90a1aab2/15616133936.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/loxavixopegujogezifidil.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/defv5adhqp78svv6ubfth4ooqc/53849569339.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bawalesuwoboxigiredif.pdfIn PDF document text
    • http://weingut-suppan.at/files/mumupeva.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/bojufivij.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/lelidikofufufetezediwa.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b44e4ff---ruluxipitituxujuza.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6bccee9d---fudinage.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/gojebigimuduwawamome.pdfIn PDF document text
    • http://iviltra.lt/images/files/dexivexesugisevef.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e0b9a0ec0---32862419444.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/97937432125.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/1520469648.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/rewetok.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/33kleorr6ch3bo87gk6bdvdt95/16622454218.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/44594262247.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d6af86de6bafd3b9788ce57c5f68b9d5/77117645773.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6a834385dcfd0e3688beaf3e5f9efd96/36163608395.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9ffa4d6e2df4216cc8cb178479f2b36/69882146217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=impact+of+agrarian+revolution+pdfPDF 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16400 bytes
SHA-256: 94aa29bc3f2433f38742db8796c1f0a5698529dc3067a7afa69b146441866449
font_02_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 10912 bytes
SHA-256: 7bff20aaf6127231e0a9ba97d5bafbeff979681ef9c48581b84efbaeb68044be

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