Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb58483c216f0df1…

MALICIOUS

PDF

98.2 KB Created: 2021-07-13 19:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c15da9602595d0bb49a6b46f194a15f1 SHA-1: 8cb34370a581f76ef1c14abf49b0f166d2c6b8cb SHA-256: bb58483c216f0df136c1de3d6c173c0f294eb4c7d3d93bd1d996d67dd4cfc648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://drafthe.ru/uplcv?utm_term=different+types+of+ghee
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a3eeaab4---57004920345.pdf
    • https://dalton-english.com/userfiles/file/nevesu.pdf
    • https://faceless.me/userfiles/files/zetudiguwa.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/40132259601.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838104a65d8---kuzekoponotefi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1fb199565bb5cd099c99ee9e12b9e772/ziseju.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fa6eadaa---20456637523.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5910e7d86---vilelusitefowom.pdf
    • http://www.urbanwaterways.info/files/44548155150.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb15ed881a---fewepixusiralexovitopo.pdf
    • https://paklya.su/design/img/upload/file/82979062900.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ju3kd0oo89eloe9t9k0c76vq0/kajumarun.pdf
    • http://bmcnx.com/userfiles/file/20161555178.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5031764e---gopulugodexutufowefena.pdf
    • http://strandedtattoo.net/file/fimanaxega.pdf
    • https://samngaimarble.com/html_upload/file/wirikesewapuru.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/380fae05bb2cd0da0ff5403e48cfb130/46421087492.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097178f7ea8d---lowanerox.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/198d5d98f03164d4e846cdf9fc179d14/nanela.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/novunikukigixiga.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b660d029fc5---podezor.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e91c8013---26353789035.pdf
    • http://calebdobe.com/clients/875189/File/32291514738.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1bb75c12---77185673930.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/eb26da20ece2c345658904bc4eac1ce0/jolilun.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ci6t1ebuiaspgad24e32pnn5g2/20248920125.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1653936cc3a62d18fa354f8a95227be0/dekewenujun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c0.bin
7f736c48fbe0338146efbbe0668cdafdd3b8a4da6a08895dc26ad309a23cb3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 20996 bytes
font_01_sfnt_off00014b3c.bin
972b7d905cd114f66a40abebcd2a41fb70c498bdafa7610314c9efe890ab2f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3C 10544 bytes
font_02_sfnt_off0001633f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1633F 16792 bytes

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