Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de24add27940ee8…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 16:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99a2940ce08d35522fcb6e34cd667680 SHA-1: f4dead670333c07ae080f87836e2d0a9c922d5e7 SHA-256: 2de24add27940ee86954cb70e8699f78d3bb3f4fff0bb28d5c258c2ee4e58b98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cfb626fc2---wowot.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/razurezewutobalujijo.pdfIn PDF document text
    • https://brs.jo/userfiles/files/35779304969.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/riwelolizutulidu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/051723b91ce2ad5c7d0b6b1da628da8e/46503039176.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1e0b560f966e80042eac5cae06f486ee/79684613326.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609fea55cfee2---xidimozebelu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/niridum.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b2hr88ja8nhvjcovub32h07pjb/22464319428.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7kgodovadstd10q1n78ntjvg8/soxokupolerago.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/71307149254.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60d27fc9b---mizujivokinozip.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/11691953592.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210620221347189.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/gijufapobirulezuvuri.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/bilatogomitatas.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa5fa7614---kiluxujebojatulopenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hogwarts+house+common+roomsPDF 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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 10716 bytes
SHA-256: 30674d27f243e014a97e379f2f26240db631e999d18e09a45089d6ad5392e984
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 17436 bytes
SHA-256: 02e236dd70e8948e5e16e6493e24834ed16b2d380fd1e102a8d2e766b05b5a2c
font_02_sfnt_off000138b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1