Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7739efe8bae2001…

MALICIOUS

PDF

100.8 KB Created: 2021-09-02 14:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c7f2dfa4ccfd3ac4036e6284db14f76 SHA-1: da973ab36341ddf43cbf907b0de3b1096abed912 SHA-256: e7739efe8bae2001459433ff38bcb91d9d101991baac553591283278db1d31e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://ecofincas.net/ckfinder/userfiles/files/vutojifewovaxifojo.pdf In PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/82619308655.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a650c397---93925510984.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202108311412082306.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6fd6f56793cd746953fb586523bf6697/naladegutila.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/77912755967.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/4310444184.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ikcvjl1m3mf9mj5l76md1a9f6l/viganazafole.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/kuwobased.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vakurenamavebiviki.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161217a6e2e7fd---vigabuvosuxinazibafogev.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117792dd255b---88678446583.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/96725756857.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/xufimedelugifimuvi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a43b0049f---7165274834.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fa439ce1---4088212173.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/kptdt1t4n9sqvbf5v8qjbtshd8/45334821845.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b0fe8fc4817875da6fbf6df4a13e965a/volepurakabosuwup.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/23469777400.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/84gcor03djvqq2plbpjniuns83/2966750877.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fidon.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c9686dae---40957144481.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pugasilipavosimedavano.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/diramamozifajudomi.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/balokodez.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2950b6513f---pafegojisotidez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=absorpsi+obat+secara+in+vitro+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_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 10752 bytes
SHA-256: 9f7573b985f9104ecaa532f96701a93d178138b8f27202a4abb196cff8846596
font_01_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 18832 bytes
SHA-256: 823eb25649fd6691fe8378218dd3fca39c72bf9c42fd824ba710983b09b71eba
font_02_sfnt_off00016d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1