Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd0365f7dc21125…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 02:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84d7710d55fb48b0fe8cd0cf7b851277 SHA-1: 3e4d9930475d9c5128a4514962b256e472f0d8c0 SHA-256: 2cd0365f7dc211258fbbf6c581efcd7e7534debe618b57598bd2d6d10be48441
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ranagro.com/files/87881180219.pdf In PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/satopozop.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/35136831869.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/gikarumovumetiw.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/79810618039.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/27641255530.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/92506988565.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160766b3ce04f6---marabesu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379573e34c---lonenabubapoxiremolarowo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7eab3a40b27589fea9d2d7e5d20a0f2d/razuvet.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/13388793197.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/ripafejako.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mojexa.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xozapokufeve.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605102503.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160893955f0726---kozeku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607773cf9794e---44819935237.pdfIn PDF document text
    • http://kmsenior.org/file/files/46863042250.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zigolobimogovixuxoxevurij.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611df251347d3---nesatizana.pdfIn PDF document text
    • http://short-story.ru/upload/file/pagonirewebeka.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/ganefufurukidon.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf627c5ee6---33853074612.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1ede443e---19118140905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+draw+a+face+step+by+step+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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10704 bytes
SHA-256: 086c33b3397a7b06973654f6332fdd58e0b3eb17f721dd1f36396fd8a55e99a7
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 17928 bytes
SHA-256: bdab3c5b19041748053382a800634723b1336479378588ec4cab55578b8569de
font_02_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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