Malicious PDF — malware analysis report

Static analysis result for SHA-256 010d4bb1d969ee97…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 15:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72d8335c396dafa4f48a39aa24f5e384 SHA-1: 31f415792bf51c85e3293da624b5ff1ab293a122 SHA-256: 010d4bb1d969ee9744437ff4c852d82cb1719afa7d5c0cf4d5831be8b52ae508
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/47904569e919a71925cdb04474bcba6e/3251348943.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1061165f---94724749193.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2f295b8946eb751d93dff504a96e8a/dobovedokekifogenibisev.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e2c97d7f3---wabifug.pdf
    • http://ducthoaudio.com/upload/files/16282454160.pdf
    • http://harissarantis.com/userfiles/files/81076944240.pdf
    • http://appartenvue.net/appart/upload/images/54731228186.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7fbb4d14021ad0bbbde59f1488a29140/pesepuputinesorapu.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71f9664d---pizuwaxanoloxef.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jkmi0182lhu49ikh03vo8h64vt/muwuv.pdf
    • http://maihome.hu/admin1/file/dowepuvoxejusubumi.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a6a5780b8457d7759dad0ef7cb64c06/93680453253.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807bb29622---nekegufazakupor.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c6349e18fa591201216dc0657cfb9db/58619492956.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/fazikusakolos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+long+does+it+take+to+watch+banana+fish
    • 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_off0000e22a.bin
bab754574cf706360b9fb61af2edf569918e804bec215c0995812cc665b06342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10964 bytes
font_01_sfnt_off0000fb63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
font_02_sfnt_off00011375.bin
2fdfcb857d57103d9b0ae8d85ebd6f562e1fd5941950fb5a8735f70fac74d7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 17420 bytes

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