Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67d7263e7a14a93…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85070af55e098eda49f7de307fc2cac5 SHA-1: 1516550b82ca96cbea8cbdcba33362bf66b915b2 SHA-256: e67d7263e7a14a9378ff9d7d3332782efe070b8a1b35e09301378427f6227390
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and functions as a link farm, directing users to multiple compromised domains and disposable hosting sites, likely to distribute further malicious content or phish for information. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

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
  • 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://krisoc.ru/uplcv?utm_term=vector+calculus+book+pdf+free+download PDF link annotation
    • http://ohmamakitchen.com/uploads/files/pekanorer.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10a67035b---4138138516.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/penepi.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wenirolegokatetewirajefa.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/95058182888.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/54206056913.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/jejusuzuzopewum.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/93385447842.pdfIn PDF document text
    • http://autovoda.ru/upload/files/dapunit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370873cc954---febagusibudu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161419dd7347aa---nuxoxalol.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14961828168.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sexegolawevuxezotakad.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/varubuxudodutiv.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jogavilozapawoze.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lakesunusew.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030c27dbce---90051400535.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/tikaja.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/79974503557.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_105635_126.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380d04334f4---45066682592.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39bf51ff9---bimoxulobagalopukilewow.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/18490873096.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/medoxuvigelimem.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_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 17104 bytes
SHA-256: 8956d3b337273405df6eb4ec53d918506d1b5b1343ad00c5570880d43106e85a
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 10908 bytes
SHA-256: a32b83906adbfbd7a7933b9a83586bcf09537cd55d2ce49d4830ef6621146206

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