Malicious PDF — malware analysis report

Static analysis result for SHA-256 0012a9ca63b68b58…

MALICIOUS

PDF

114.8 KB Created: 2021-06-29 01:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad6265b500594caf9401950e3ef2563b SHA-1: 9281a0471ecb9ddea8fee773df62af37d3b0440e SHA-256: 0012a9ca63b68b586425f1ac80969d2d5215384ffd8a687ecde64e0fa8477562
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many pointing to compromised CMS upload directories, further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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 https://nomylo.ru/uplcv?utm_term=mahler+and+wagner
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b37234f484b6a90c6cb305a5fa4f3f3d/bazopazogejexu.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95868a252---25441941921.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cee27d60f---zerekogonuwezeliworiwerem.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607381f67da3b---nupibakagewesanometi.pdf
    • https://sonarmusic.hu/up_image/file/gesewomifosusenu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda15126c62---16448229773.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e205ab4b5710f63f397a8daa286798a6/40972678867.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pdlvq3p9mdiq9eh602b3s55tnv/gujidolevumupigonuje.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/981cd4e0f2a596936667d61f64dfa3da/703600812.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/mavodatadesani.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/k3hb9tu4toanfl2d4ccrpsahk4/31107905117.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c13c965b6---golevilixusawinu.pdf
    • http://giasuminhtam.com/Images_upload/files/39882732900.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/82050652524.pdf
    • https://kund-in.com/userfiles/file/8440996548.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d09f27510---wuramumagewilanixasadabep.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/gumobadogunavijafenalomi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6697c939bb---xufupenijena.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a46db0ee3e2---30051681339.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acda790df4d---83005999331.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986329cb8dd---pimiwaruxoponijajeve.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf484fecc---34372185598.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d23dea355af70b74dd2c4b855dbed76/mubegonufo.pdf
    • http://karimeh.com/public/userfiles/file/tebajebujozekipufewu.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5cac2826d---80302134551.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e8124533e---bogeberisuduneremaxepi.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/233b9d43505874a7be3b244f24dda4ed/zawujez.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_off00015b22.bin
fe01024a0f9c8408014f8b1c8b9c3ef05133eec211680388376f08a433621b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B22 21308 bytes
font_01_sfnt_off00018faa.bin
987afc5ffc17cca15c175a6a652c31d4eade9ce043d271a93b61ce9ed3397168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FAA 10128 bytes
font_02_sfnt_off0001a604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A604 16792 bytes

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