Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d8fd808cf57d3a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-07 00:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f91b47b40ca582f4e08f1b5750f9d1d2 SHA-1: f74b843ae5812da8a12e205ea93464f22bb7bdc6 SHA-256: 18d8fd808cf57d3a2dafaeac136eb850077e6532a3833109e68607db352b6889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bukhatirhomes.com/userfiles/file/73379055840.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/xesilubozapudawalakibu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100b72e9b0be---52209334496.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/49996962954.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/34903442291.pdfIn PDF document text
    • http://firegallery.ru/img/upload/xisov.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3dc394047f9675620da439c30d33fbac/49224060315.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160859e7658666---lekufakutazejitade.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/80796226784.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lrr73dngd1uj8ub31ts7gb6of5/torubomesipuke.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/rofaj.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/zavuwitetonasaxol.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/83546106084.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/vuvadulixepilazavavov.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084090074655---xuvodorividelaxim.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jojarafujami.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/3160258632.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610789abc1266---rukuren.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2628398d89ce66d9f85bb7816120252c/53854365972.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/l00ql9ak7e0snv0l40qen7olts/91591116853.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/mepogimozofivusejowepapen.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/v6e4139kt2a1avp13fej6r8g4m/74591952053.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/85491729535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=6th+grade+comprehension+worksheets+printablePDF 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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 11348 bytes
SHA-256: ac06d992f10f276aeffda71d51f6b852a27eae2a813ed7292af080cb7c48ed03
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 14436 bytes
SHA-256: ed30f4393a2bd29605d61a0dc264aa464475406ece632a570ecb19f5e38564cb
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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