Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87c7c75edcb4e0b…

MALICIOUS

PDF

102.4 KB Created: 2021-07-05 23:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6ccdcdd68039fd5afc14f586860b31b8 SHA-1: 6099f80c0c001a7cfe909e553b79ba1f0b381010 SHA-256: d87c7c75edcb4e0bb3362c65f727fcc9141d3f4be1256e1ce39b1d9dc8267468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a58e8ee9---86982228330.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/2021624348233323.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e7203dc02c42b1071945bebce29f273b/gebepaxalewigas.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/33785052470.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23919a0674---nijubebonozukazat.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/keqihv0vs9tid8ob4vnh1q0kc5/kinuvibazogew.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/44bd8f0de387e159cd29269c988d881a/61937378803.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9l2lprno744r5ogcc5cm989mql/10964600155.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/suziduxasuxivaves.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d64659619e5f679ba0c45fffc4ede6db/51052838301.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/44901949274.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/jopuzowipesokotekage.pdfIn PDF document text
    • https://digireg.se/upload/vimitujapagewofomuwugu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/roxidukajekabuzugakumen.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/df9b1054e379364fc55f0d941631b42f/zadane.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/38bce04919ab6925f475a02fb536ba11/nediw.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad093a89---9613326440.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ieotps27iusjh60jds1m8vais4/mekavipinigilexepanuxog.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4353667854.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c27671da83258514a1089ead1b304e7b/pototenuso.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/3258972187.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/toxesopif.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/bilininebugazit.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/likoxagelodipal.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/tegazame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=juvenile+meaning+in+marathiPDF 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_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 10424 bytes
SHA-256: 84db728fe789124f6dc1b0c3f7e83317b83cb08c467e0f0447c2c8ae925f8fb2
font_01_sfnt_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 15304 bytes
SHA-256: 43997d3c37245b52f7f3c3405740cc3cae5b641f119d4755a5f2a3f025bd01ca
font_02_sfnt_off00017434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1