Malicious PDF — malware analysis report

Static analysis result for SHA-256 7019b5384abebe57…

MALICIOUS

PDF

102.2 KB Created: 2021-09-06 11:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15ab3b9b25fcd030102dc6d73c3e49c3 SHA-1: 6f80a46b843c2900f029e1b0f75e6b0167ae84c2 SHA-256: 7019b5384abebe57f3a6be02d5405e770601c96bab3fbc4a30b42e4133786b2b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document's primary purpose is to redirect users to potentially malicious sites, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 5

  • 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://rhodeislandalpha.com/clients/56223/File/83385776276.pdf In PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/27929e25afd84b0deb2f69e78bf70ced/11500335053.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/govekasexumidinuno.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127d811892fa---45892232126.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d41b7497d---kimunabiwuk.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2471477419.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/duxuzigixile.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72110532895.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/30288511120.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb5ec794b---30346671547.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/megitukufibifiwamis.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0ol2t4b2p96t3cf1i623l8243q/pazefejonoferixekudojeso.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/nonux.pdfIn PDF document text
    • http://stromzeleny.cz/file/sebubuvi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kuwun.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/62647140689.pdfIn PDF document text
    • https://orrizon.ru/images/file/64045650188.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/18902732532.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/50801755737.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/67492011455.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070079add929---93097729975.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/84970612308.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1562b3107fa6c3070ed564c8aa33bff1/fowip.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee335f67c---65939719267.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jibozibex.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/foxawikajodalarejok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=narrativa+historica+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_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 20156 bytes
SHA-256: bfd6134e09a5288af1b9396fa0f04c8a95f208e6dce8f538160341b565fc8456
font_02_sfnt_off0001731d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731D 10476 bytes
SHA-256: f80d2aafe803501470d7df268b7a30ce1d88ed5245a2b2562f412585fcc81ddb

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