Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebe1be215aae528…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 21:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 526579f61c31cec247e689e86abbfb3b SHA-1: 99fbcc23a6274d6626d7fe43fbca6f18ecf2bbf6 SHA-256: 0ebe1be215aae528ca6197b8f0f06d448544b3692a2ce5b4cd7e71fe86ad6e7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65b393e34---10043623326.pdf In PDF document text
    • https://airbays.com/userfiles/file/74307241816.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/37993919760.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/78706148052.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/zamupobu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4d461dd5---pilituvalavutib.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/96720610872.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/8519649584.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/lasubirerona.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/71813001082.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/vuzunimebadomafajorit.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16231728443.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/megudaduxit.pdfIn PDF document text
    • http://ippon.lv/uploads/File/nopawoladesamisaperu.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/63469239974.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/fodevoxotinajako.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e6af052686432658f802e23365cab3c6/88308161122.pdfIn PDF document text
    • https://teamcode.net/upload/files/63912338825.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/dipajutazaniba.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2e5c01a3dc2be57114e178fd0c141045/15570706644.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/97020247158.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/92958379639.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rofasesufufegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=among+us+9.22+s+downloadPDF 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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 10692 bytes
SHA-256: 1f7753408aa217149f2ff9c1c530cd187a7c02e53f9787f03e8da38885a24b14
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 19544 bytes
SHA-256: ad252b67fb8bef80f5b878b863e49dd9e24f8947030b3d18e0bb492cf5d7dfc9
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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