Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61d16b788d73f18…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 03:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4a734241441188fb521678f2ba89bd5 SHA-1: dffc309d3e4a44bac5f4710f8d6065baaa60d719 SHA-256: e61d16b788d73f189d59859f9ac86d7d58405f5413c3d0d4d8549f181b69fe3c
104 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple compromised CMS upload links suggests an attempt to leverage these sites for malicious purposes, potentially for SEO spam or hosting further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=how+do+you+record+a+game+on+your+phone PDF link annotation
    • https://highlander-inn.com/assets/userfiles/files/88333424047.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3a723d9f---53128190739.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/52189080765.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/wexifalotur.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vopaxosodotejake.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/kotoxapawowaf.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/92932418401.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413598e0285---toritibanize.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/titixeguvowatejalepesasoj.pdfIn PDF document text
    • http://huiking.cn/uploads/file/051607508262.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfe3fdeb---topos.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137373834923---rosinomanebavugute.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_AADCEEA218164F8F.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/14687476825.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/39682991327.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/dazem.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zufukinetixewijuparaleme.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/86096386553.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/23641847757.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/37450309600.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/19794519352.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613581c08bc2d---zujepinojokezam.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/sujofekezale.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdfIn PDF document text
    • http://uchid.com/uploads/file/6457859756.pdfIn PDF document text
    • 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 18340 bytes
SHA-256: aa5529150644db1b09cbe95898cd419bc0e5a60a5681fe597233346956ff1ecb
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 10848 bytes
SHA-256: 2a943a62d5ade3b7b738213f108b538b351b4f61cfdacbdad3d9b4e37eba80c2

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