Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a8862afabcc8c7…

MALICIOUS

PDF

88.3 KB Created: 2021-07-29 21:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d82882cc3def1f16edf0fbb885e08fac SHA-1: 43901e67921e301a78df3c4ac8f03eff9aa969e4 SHA-256: a4a8862afabcc8c79dd76fd57d5557bd80c50c8328a453e2dac22f2e446312a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885017c5cbe---dofifomubapuzalit.pdf In PDF document text
    • http://innovad-ltd.com/userfiles/file/7567735792.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/sijatonejasem.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mezezumo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba39ed3abf---72318264374.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab547e4a6b7---nusodumonumetalaxukivesu.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/loseb.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eef0ab0f88ef23728bdafdffb9de0c52/59838321616.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/frb533c5sac4pj2o7741h51f1r/bexiboterifajizodipije.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/wubegopabado.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/79eeacf2e770af3e5197f90d7066b1e5/xuzozoluvejalipekepugoga.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s7ih7ohrd41p866chahkc6qe45/miroraxuz.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/71668655983.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gafitetaloramep.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nhvmstqjgmca3a2eflhi2in7ro/91812506834.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vitenigomidol.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c9db14744cca33c62f2eb8c8b0ab9be7/bujipil.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6bdf58a76---97330926167.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93808d2a88---jezasawe.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c4b39e04---bexobamode.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/91252883137.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/nomewozukoduvepix.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c6ea102812388d88d82cfe47aff1242a/33397499545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+your+bmr+to+gain+weightPDF 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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 10940 bytes
SHA-256: b7ebbe56bd437c83c25e40c6ee68b40eb9a514435024710c5cbfb67cc1f0cd28
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 17360 bytes
SHA-256: 18e00f4e4e413c6d960157db88a0337b64b808e74b91797454eb251306ea63fb
font_02_sfnt_off00013bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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