Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb68f2ebcf9d6872…

MALICIOUS

PDF

74.7 KB Created: 2021-08-14 13:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d289e5a187677365a72fd271ac8a643 SHA-1: d7ad7ce49796c3a2483b7741d65199f5a43f361d SHA-256: bb68f2ebcf9d6872f361c6512b720fa9de50f4a1363bdbdbea82542c1ff8de02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to unknown PDF files hosted on compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40617c9b9---9546831788.pdf In PDF document text
    • http://ats-dz.com/userfiles/file/mubuzugipizuvafuf.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/30679953815.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/54309446927.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/muvofurukiduvobid.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/29399163643.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2198bb4b---60579999633.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/891317f84de8df117c3fa2b2f48bac05/verumozudeponagegoduranip.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e357d4a095---vinatataribijojejuja.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/afbea6cb2a32570c78a0cac1a8d06b09/37867595992.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/65138f120ad6e09dcbe245212195aa1c/45542136315.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f3e3a8e69a1524f2591cb5707e46ad74/zuxak.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db5bb1d38---35951157306.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2109ec3---79820731290.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210714115926.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vataregolira.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/43258486957.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/91235499663.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc842ecbc---71464408110.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/64ff7e0ce60e74816c87ef52492b040d/70933466672.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210619140512.pdfIn PDF document text
    • http://lawngo.net/fckfiles/modovasugomajovepif.pdfIn PDF document text
    • http://byecook.com/ckupload/files/wedatelubuwutulu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/52331444790.pdfIn PDF document text
    • https://securitydm.com/slicice/file/miwuwivulowisubokuzofub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+meaning+of+17+in+the+biblePDF 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_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 10796 bytes
SHA-256: 13a0904b95d668bacd5b3f34563dc78a9b3cd6c3e1b5ab90cadbfc770dd17b59
font_01_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 16152 bytes
SHA-256: 9ed4c90cd0eb19bc0b4758afcf31b54173043e267078bd9e07f72b567b970ca9
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1