Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e2f90b86146bf…

MALICIOUS

PDF

104.0 KB Created: 2021-06-27 20:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 23899d81abe8f7fbcefe62d69463b1d9 SHA-1: d29b6674a647e74795daa910f5cb730163dbf427 SHA-256: 1f8e2f90b86146bfb6e2f2b7cebaf9409472eb1a1e06bb35e870f9167c13c6df
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbbcb082---nobazanozoduputo.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10eb17d6---14821426684.pdfPDF link annotation
    • http://hondasushi.com/uploads/files/42203382702.pdfIn PDF document text
    • https://digireg.cn/upload/vomos.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624249777.pdfIn PDF document text
    • https://digireg.nu/upload/48387515988.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bf67edb1c398cbc78e146babe882cbe2/naxutigaluxibibekujize.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/94715778280.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/2383009295.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b258e253---viboleforoparawonis.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/97qc8dgu8ucsbgbeucllmvadcm/rafanaxogej.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/8802269275.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/tuxewe.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/26642660255.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc2cce383---pipimonubo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7d7ea199820612f8243c0cfec4bc9a75/jumurekipugek.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0965c394---30629069055.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/53869303206.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bfc29c9eb8fab0b66027e49c439ea8f/71494441588.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fc067477---63422954599.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/35268532589.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f2b95cba---nebidunaravaxulisorox.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdc9509b9---benerapup.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081edddc9417---31114373840.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8o68mir0n19h8l9hg5p2qn0b2t/5055372019.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/sizulejuvosonuvut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=single+spine+salary+structure+2019+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_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 17256 bytes
SHA-256: d1d5b664fac8b9caded5f343816428a54ea5a8edbf924d94dfb1f773c07b242b
font_02_sfnt_off000175f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F9 11428 bytes
SHA-256: b5f9dff1f6a12c1362bc2f1335005494f4687ac1c5d87794624917fa2fc4d060

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