Malicious PDF — malware analysis report

Static analysis result for SHA-256 c330ea653dd8b5ed…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 19:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eacb313f775aaf879cc8b9c784b02f75 SHA-1: 14902d6ae369cd9bcb8f81ecc178a9e1ef2dace4 SHA-256: c330ea653dd8b5ed1038d7511b48b0fe1daa844a04c8ec6c549ccec906637339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9029e8272c---56108816679.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/kuvawulizumubasaluparod.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sivolabozewiraguge.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/433d3699f0260177f24b721903d18b0c/90774809201.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/94944099331.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c7173b51---38961067301.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/11967725929.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ba0987f5---zajeret.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/5906238061.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4450ebfd1---7765890041.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/xivetoborupojimomijot.pdfIn PDF document text
    • http://geodez.com/pliki/file/72092357873.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dogume.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60bd215338---towapenuzogitiwumonen.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cadcec403b5---jubuf.pdfIn PDF document text
    • http://tfforming.ru/d/files/guvaritijosaxojepu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4117d46c8eef72ca22f17c9cc8fba1b4/xegurisenepikuxapa.pdfIn PDF document text
    • http://saydersan.com/firma/files/83269592004.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/dogiwuf.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a3fe3e23---gutale.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/76524553277.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/63057228786.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/lovekisuxumoji.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/29202273030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+do+data+scientists+earn+in+south+africaPDF 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 10872 bytes
SHA-256: 22cd885cf57be1b0f36aab8648ecdd2c5f1d0b7706ee1403e2b5637cce839d0e
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16816 bytes
SHA-256: 7926437ecb77253132fff2897071c342d5e62a6740188cc81d9d62095def9e1c
font_02_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1