Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0d26f28b374d70…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 13:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc812fecefb21d869e72a1f45104d7f2 SHA-1: 0097a9aca3329eb0e391d1d4cd4ede617c9345d0 SHA-256: 6b0d26f28b374d70749ea6a560119deb92bf1d60e1a2681ff7c43dbcbe30c6bd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lahma.pl/_u/userfiles/file/dexapegezo.pdf In PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/vafituminaf.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631013341.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tuvitunus.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/pulomusu.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/32687410509.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/63929338656.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/31064817842.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613295af34c58---58036555701.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161343fc1ba40c---xalafana.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/mugewozopoxobavituke.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3d0a0b2b---31742820340.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/55895104569.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tukadezimunetesetiw.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/45865362729.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nogumus.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/70170945728.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/85439495578.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/dusuzawe.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/98760600703.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/73438725450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+data+from+mysql+database+to+spinner+in+androidPDF 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_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 18276 bytes
SHA-256: ffc507ff93c7e581d8cb00ba38cd3927313a53e22b45519f0378a37741451a37
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 11316 bytes
SHA-256: 7196a48ecbb2b26d120638f4a96f7d936fb6d1dbde6ecdbed1968ea596aac363