Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e1aea445638bcf…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 09:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c15404086091c53ba3b04aaf05635b1d SHA-1: 7c585e40aee6019c27cfa6f84c4626e945adede8 SHA-256: c4e1aea445638bcff68bfedb00a1e3e6e03d918e5fd67b821bb563366f27c971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7762762436.pdf In PDF document text
    • http://alphanaturehk.com/userfiles/file/damafuwig.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/mugojaxoratimu.pdfIn PDF document text
    • http://ge-mak.com/files/56945929244.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/6581986034.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/19638361724.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/66427715433.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/808d4b7ed5903020c617895b35070e16/14184464190.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41b034288---tijipowadogifopalaw.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d3ca4f8db9c787b9e54fbac8ac66be05/10677668521.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/87590344310.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d9c92e750c904e4ac7853276df69186/13165280739.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/66401533592.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/53441174839.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/37194970217.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/19739059956.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/tinadi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bovifowevedawunomomosage.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61642217099.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/kofuzarewaf.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04a9e51b5---6166871794.pdfIn PDF document text
    • http://poorclarescork.ie/images/favap.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3e5192c5f8ebe9017d847dd386afb236/tadadomekubulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manual+de+u%C3%B1as+decoradas+paso+a+paso+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_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10724 bytes
SHA-256: 2a5ec559e695c9787ee2ad19658b4958134e1addf9fc4c4374caf601c92623f6
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 19392 bytes
SHA-256: 6ea416cd49f8d223685814fd4201bb73f7f727325873b9f625f8c3911a3efe2d
font_02_sfnt_off00014433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1