Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edca257648eb8d4…

MALICIOUS

PDF

96.5 KB Created: 2021-07-02 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78ee1937be2626cbc0645749854ea6b0 SHA-1: 661ad258701f8dee18926ad76e5d7cc900fd0830 SHA-256: 5edca257648eb8d4457b82d88c59c63098903b7929640f1d0eeb217a647bfdfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3113ad63e---jusopoxuwebenujifun.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/94cde11a64700e7f03cbf08f669b3aae/rijokevekapuviwugi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f8c635aa---dijozilazotopidoj.pdf
    • https://senfina.top/uploads/files/zesuribo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abe0dd82a31acf3c850a07709d630b6a/suvinijuxi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a458ab1918---47883552853.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3064e69ede---94565633780.pdf
    • http://myphamlulanjina.com/upload/files/62945006594.pdf
    • https://okud-istra.hr/userfiles/file/sujekutofa.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xinaxovixezilurasis.pdf
    • http://knshzj.com/CKEdit/upload/files/kuxobefeguginigelokiv.pdf
    • http://www.serenissimaservizi.com//files/sedekigatafenem.pdf
    • http://ed-web.cz/userfilesfile/16313864393.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/bosigapofewupevowemi.pdf
    • https://belhasasecurity.com/userfiles/file/83030945815.pdf
    • https://unique-u.biz/images/uploads/file/pokujujuke.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/9114579977.pdf
    • http://tdfinalists.ca/clients/43449/File/lalufemusufojovubakogurak.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7bc8523c2---muboditemob.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062708455880554.pdf
    • http://grandrosso.com/js/upload/files/jerewinelopavoxepofak.pdf
    • http://stlnsk.ru/uploads/file/dijujoxupatirizojuzoviz.pdf
    • https://atlastoursntravels.com/userfiles/file/burota.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7db598cf3---24374204093.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=discomfort+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000153f9.bin
3a9ec30a94c8f7a7d1007858ce57cc84e1b6ef813154fdba5abab830ab190f3a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153F9 19084 bytes
font_00_sfnt_off0000db4a.bin
10f8cc5a246583f43560e777ac9073a10903edc6a087310d14af8ffd4dc5ad5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10784 bytes
font_01_sfnt_off0000f3e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
font_02_sfnt_off00010bf9.bin
d8b707266da7e6f1ce659b9bec50d1549fc83c48f11d9b3d20ae93acfcf0d250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 23392 bytes
font_03_sfnt_off0001467f.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1467F 3464 bytes

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