Malicious PDF — malware analysis report

Static analysis result for SHA-256 e083864dae4d171b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 13:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d7a0c517ee0590329a1588e1138ce53 SHA-1: bdd8d073fd8df2e32c5e1eb74974f322a5e5576f SHA-256: e083864dae4d171b1738e9025af8b9f3a8c079cbb354fa3526fc7c45975c8bb2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting an attempt to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aspit.ro/imagini_ws/rudutonedixatemex.pdf In PDF document text
    • http://myshiou.com/uploads/files/202109131724562761.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/jagoka.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f269836---nanutadupaloroxogo.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/17788115333.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/80694374476.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff4529110---dolubonidodakeji.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/86227238454.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c995740eaa9994beb2480f23a57bcef8/88065584605.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9rsn625d58u4l8etdaeqq7e2p1/taxilapadewoponesase.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/bamasiloxote.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/89988730509.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/fekeritisutanegatudizik.pdfIn PDF document text
    • https://italvaping.com/file/8867130002.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/83989461137.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/24335950554.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/4943891742.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e92bc49f5fb172deb1e237ba05003dda/95138894772.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/penilofizipaperuz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2b0abe4b85ddb086dced32adca6217f2/viduwapefesis.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/maxejazorutedukiriwa.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/rewawavejobasawejejutarod.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136943687afc---89528894189.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdfIn PDF document text
    • http://synhbio.com/upload/files/sesesaluzevuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+change+home+screen+orderPDF 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_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 17388 bytes
SHA-256: d5219b87b4803173a9feb0635792075c987f95697ae20adcf5ebccbcff613303
font_02_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 10652 bytes
SHA-256: a9e852142a71550fe0246792fd7faaa1ad2ce3fb5cdfdbe0659b25393c0761ee