Malicious PDF — malware analysis report

Static analysis result for SHA-256 e238743c94320b2a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 00:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7ebc4fe4ebfe6bdca3fbeb180c865ed SHA-1: 72db424ff8f198ad4e986c3c7a7fe841bcb8732a SHA-256: e238743c94320b2a0939fc403dfac634f061ffb8224a8300af03c9b07a4e4797
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of multiple links to potentially compromised CMS upload directories further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=czardas+chords+pdf PDF link annotation
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/87f3210b5d25ca64b71ee80df7c37a20/sutabodizutinefonemufiw.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db520d99809---26103041425.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/17057629821.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c947fc72ab---xotamigogorobakubaj.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xunixinip.pdfIn PDF document text
    • http://wami.cc/data/files/41746117780.pdfIn PDF document text
    • http://svx.su/ffile/file/zupidonuwu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e26f7c5a90963d78e8d0dde14a0c5458/gixevawemuzexotu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/buromomodirugipe.pdfIn PDF document text
    • http://netshopnepal.com/userfiles/file/58825706468.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b39dae6e6---21364462469.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085592fe5e69---paliwokoli.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/52413345022.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/zalodex.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/28928936221.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/39995607118.pdfIn PDF document text
    • http://anm-av.de/uploads/files/datuwizeponojanu.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/juson.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/49039443590.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/posifutuvojitetogefaso.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160931cf6a8692---46564109702.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607384ae8e165---lexiloxewibiditapalume.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 17240 bytes
SHA-256: 942b05eab97617697890c4612872fab24806cbf4fc8e2c1220897feec68f27aa
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 10336 bytes
SHA-256: 146e960cce483625179d6b55153ab33139ae9063d3725dcc33190c63c0feca93

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