Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c140903db9015e9…

MALICIOUS

PDF

125.6 KB Created: 2021-07-03 20:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e003cdf67af0add237d8fe9d34ff410 SHA-1: 4f0cece776e789d7af3e62f398de6d3b5b606946 SHA-256: 7c140903db9015e9120a20ec04387d04001a475e70f6c5447e16174b9785a33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and UTM parameters in URLs further supports a campaign to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://irlanc.ru/uplcv?utm_term=exhausted+in+arabic
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2141cee606---pitirupato.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/24a05ecf60c24259a17aee3b6b055b95/80885136044.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e46bafeaf---tirilimekerepezexalesoni.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d42e859aee77375c5f3d52a293bace4/220255197.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wagujogasadinixepokeru.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d1f2e27a---37413471486.pdf
    • https://swalaya.in/userfiles/file/75520570839.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/37896111529.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fec5fc4e---limuwuxudob.pdf
    • http://alacarte-design.de/userfiles/file/51036211700.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/07ae022ecb24578b92e0319fb7925ae3/92215806753.pdf
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/59550915367.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd151c6d0a4250be3fa7e101fee2dd/24746746253.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160800e5f487b0---fexomux.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d0980ec8a---sefopovutinosavuduj.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/j5lus805qjg4ohrophlhgdpbl7/romopejojafelusalejife.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099346bf121a---xonujopubajili.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608338ef6a5a1---vuxuvojojefoxag.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4peud440htp48597p6iilpnmh0/53689931842.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd712b8db---rufitudoguputizotax.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ac548ce2---78022029435.pdf
    • http://vladjurnalist.ru/archive/file/giferuxaso.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000186bb.bin
5cd44ab072e676936b212d33de9f3ef4ceffd38f02f9637b6e34d2c1dc0b4882		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x186BB 29824 bytes
font_00_sfnt_off00015665.bin
a821b5167cc323ca0829dd21ff599595be805f2fd8320d2b065b8a9583423c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15665 10628 bytes
font_01_sfnt_off00016eaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAA 16792 bytes
font_03_sfnt_off0001bc49.bin
e5bc2892e605cba277a1a0859441c7b267ecf6cc0237099da6ad5e524cc44d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC49 16652 bytes

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