Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1852ce66583c38…

MALICIOUS

PDF

228.5 KB Created: 2021-07-05 09:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4a781611137d243e923236744acdc50 SHA-1: 339d1b8bf1964c263572e24eb148d42e3f602eef SHA-256: 1e1852ce66583c38894f604afeff01ff9fa0035b83dbc6c3aff7482265b3a1cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating an attempt to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 5

  • 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.
  • 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://apvn.info/userfiles/file/nizelirarifovilonewixes.pdf In PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/75121087469.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tql576t1hb2r05sstue7gdeiq0/92915325173.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0i5qc6s704uqobbv18sl7d3udr/85012492466.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/f36qfdb0pno2kp0fjbhoaqvjr6/tugikakitadixo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/papererosi.pdfIn PDF document text
    • https://dhesient.com/media/bowebakilibovebuziwa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34597e84a---54745055740.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229e8639eb---kuxajerap.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/jinotuwejibape.pdfIn PDF document text
    • https://majubesar.net/contents//files/31333427323.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b246d543c6---juxul.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/34462015737.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/82885add0db9c3f58b3cdd3b3d016920/75432214974.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c061d620d2---11841386731.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7cd975d225a05345d4ba045cd3aa2ce0/38326740893.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0f083688---mutakegak.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609790fde0c06---70108746092.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/zisabogerelesekekiw.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vixujizudumemizeje.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/ef236ab077f71debd9d9a07414a12e3e/ruzibimis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609498ca9c491---xaxutikasadarenilezupula.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6d0ceb491b4546aad9593598a8f97ebb/40898229811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=importance+of+groundwater+pdfPDF 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_off00032014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00033826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33826 20164 bytes
SHA-256: 7e32457b3e8b3e5fd462b9214dd316199b7158ab78bf5808db25be437d8fbe31
font_02_sfnt_off00036bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36BD5 10792 bytes
SHA-256: e56784e62eb9f6f66cb0a92b6a7b00012d9986d82eadac7f75c4d44c46d68c00