Malicious PDF — malware analysis report

Static analysis result for SHA-256 176ccab4e3d5b39c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 18:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a80c8722f045fa32261c641f2884b01e SHA-1: 532514dae9320291518d028ef1828470090660a5 SHA-256: 176ccab4e3d5b39ca5b4064e4043c3f39183d861e31563053f2bfd7119d11d8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cafeinca.com/img/public/contenido/file/sefajup.pdf In PDF document text
    • http://chinoboxingclub.com/clients/36032/File/toxupofefusoteb.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/23109673536.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/68861078650.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/62094319356.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/63719778627.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb60b153fc---2054412710.pdfIn PDF document text
    • http://artospace.com/pics/file/danufuzofisaludow.pdfIn PDF document text
    • https://bnovum.hu/downloads/lokopofoxewilo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/62216983189.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4499abe073---zopawatutemusemifabasa.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/pipivone.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb33eb4432---94903853645.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/22473499199.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4fairbau5b58rbn5a7m64i3gp6/79413055499.pdfIn PDF document text
    • http://asvpp.fr/pdf/84451893454.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160716ab71bedb---16886578977.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/phrum3rv4m5bkb0gef0n2uaq7p/dilezixal.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/a63bb94bff4de488e4c2a804133bcea5/legajepovukuwimafaned.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/55542230025.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/16645522335.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/27eb57325df2c8fd02f113a9a0811735/1591395349.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8ceb2f92257359a9f096a006e4511569/kaworego.pdfIn PDF document text
    • https://webmenuplus.com/images/file/92721904095.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/jezuwexumekeraxereporise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dosis+insulin+novorapid+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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10428 bytes
SHA-256: 550f2b1b86cc1c69e972ef9468f39448496ecaabc9b55fce74d9091a4e286115
font_01_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 18116 bytes
SHA-256: 0f459223ca36c9b724a976cf03edc932d7e25e4cf910f8d1d01ec470c14029c3

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