Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea4e1dddd8894b2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80a31048f1fa1405fa6f97786306cce6 SHA-1: d8528c534753ac15b9df20ecc2c662346a7aa3de SHA-256: 5ea4e1dddd8894b2d257159d09f965298bf14bf6b345eade774ad594f5ced14b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=salitang+ugat+worksheet PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mit3hvqr6r0jtgh30lt1mdb4mk/58897239876.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/94250379527.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6c2ad7ebc55d16f59f441f5aee70d9c/jewugogibad.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec69e9c0b1---nerofuwoditi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/5778785145.pdfIn PDF document text
    • http://yoron.net/up/files/76353145348.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21270409265.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/55899827327.pdfIn PDF document text
    • http://technocom.pl/editor/file/57214137444.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/36727269272.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/460766783.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/20408973271.pdfIn PDF document text
    • http://orem.mn/uploads/files/kosigadopujironowetam.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/92495836659.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/majeri.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/jipaluxuzomovokefe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18053521661.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801a90da3cf---94909209150.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zukotusotuvedalulox.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/vozibemasitexirewujin.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/kivusupezapibezafaxovube.pdfIn PDF document text
    • 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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 19324 bytes
SHA-256: 36d05b18ce48de155cbe57611274dfadb1ba4b34c299ff61084cdcf4d3ba64d0
font_01_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 10740 bytes
SHA-256: 3304a878c3e9f59be50416be8122e6d12bbf713cbcd51c4b52f7e3be4583cebf
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1