Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce43080c03064068…

MALICIOUS

PDF

87.3 KB Created: 2021-07-23 07:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a3fbafa679a5c0e833fbe223f5d10b1 SHA-1: d476a46e04dd47cccb5fa81b40e9fce6eb73f015 SHA-256: ce43080c03064068c37556ad4f2f2392e3637ba26695937f36e3002ef5e38266
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075f26dd5d16---tuzuliwemagewube.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/22455493059.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5300b9c8247ffaeae18b55438f30d864/75810268224.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/16815671220.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/12837034373.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff477b3f8---97689187719.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/zawodakowutuwumewowi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5p5ediknsfo67eq6nkock9ap09/monuwibomofubakawovub.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vinawujofataja.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607222b76f2f3---vorafati.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c6fb5dc2---23894038100.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16086c16939cfb---84938336265.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ab7a6e54b4feb35558026eb858b659aa/76253253886.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/tupozemosoxixivadom.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0kmmov76odfbv9hcogmgf4avd2/zidarufofamalitutoxatidox.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/41605925913.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pobipagosigiwo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3fb1007ed---fumovafinuju.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/mibilusemabuzinijifipel.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ketonusigisuriwefovirawij.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358ce009ea---48881414018.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lesagiberebuxebuwaz.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a049ee2449---73254222727.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/bajobepikugevunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=perfect+standing+there+in+my+american+apparelPDF link annotation
    • http://po.st/2e9wjyEPIn PDF document text
    • http://po.st/2NT1JEIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16896 bytes
SHA-256: 736d62cfa4cc9eb8506215dc22026672a8ae369295c05616afbbb8138adbece4
font_03_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 11060 bytes
SHA-256: bbbe03330d08dc88b469112caf8bc436d9c2260ba4690af441b7b89e81d722cb