Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41b15e86ef6bea6…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 04:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ad56866147b0466918e325db66cfa8d SHA-1: c5dcaab6794ce4dc9173f9b0fc667adba9b508d8 SHA-256: a41b15e86ef6bea639a19c20f8bcc81f36818e9cb7c81de068653b9fa579a186
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL destinations suggest a malicious document intended to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://tantex.org/tantex/tantexuserfiles/file/jebakofevanazewazenur.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac419d9e853---fetituxikowilivota.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37365ca1166c156ddd6515c280170ac/45941107038.pdf
    • https://cgeminfos.ma/upload/file/77438003325.pdf
    • http://barcelonasixtytwo.com/userfiles/file/xilozax.pdf
    • http://hongdacable.com/d/files/66382241620.pdf
    • http://i-daa-wl.de/userfiles/ramatowosuf.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4df1474aef22a0e603467b27b237286f/vedezufuvirevuterag.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e9c474bb---45464885585.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/76488507045.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e572342a4f40b0dcfb237cfe3428e856/30340719290.pdf
    • https://samarpanbharat.org/trila/userfiles/file/lizurefi.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/wojinaxegomidarutak.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210606120625.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092581d36c2c---komiwuzamadixosax.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/52374d72095b7f3640a62518d920e1fe/68199613545.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bd73b0d0---57280288045.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u06rf52cufe4bf2hus4spj6pgv/15967418674.pdf
    • http://tannhatviet.vn/upload/files/sedimigugibumasujexob.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/wakadubuvemetimi.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3kmcr5pjn1shnd6ffbjj6btu15/84630915018.pdf
    • http://www.huntsvillepr.com/files/files/90761742406.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+letters+are+there+in+the+french+alphabet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93e.bin
df217ad9d1b93fe667afe1e381fabefe4fb7c0d41f04b314892d0425b7ef6e05
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 19980 bytes
font_01_sfnt_off00011a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
font_02_sfnt_off000132a1.bin
8dc2b9b2afcf5a1be7baba293b13e6e501cc58ed90f3c986d07b35fcf79ceb8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 16852 bytes
font_03_sfnt_off00014a97.bin
2f576e9504d5c7360fc03832a65090cf1ffc4aac8cd712b4fb77b70d38ef0e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 11076 bytes