Malicious PDF — malware analysis report

Static analysis result for SHA-256 30394127433186d2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 21:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b4ecc679cf804063b232381795e4e7b SHA-1: 0d03c1883f19e010bcaf597a7d617cf247cc918c SHA-256: 30394127433186d2e770fcd7e761740dce9f93f8cb6d2ec08d89a733799fc918
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL destinations are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://istanajpdua.com/contents/files/47455225852.pdf In PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/dovujadetirudujufolid.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/rojizesax.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2581fb19065c8099cc861687c73972c1/tagetinorinuleleda.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/12251957684.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/17672371187.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/54739938436.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b864c537c---zilomizujiwiwepizijopa.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dazapapasagenovi.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/14953747978.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xemegovozuvetofisara.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/57328643948.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/foziwuwapuzitasota.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6208ebaa7---10655019180.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/mixefagukozetadava.pdfIn PDF document text
    • https://digicpictures.com/downloads/dobadubuteziworiz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89b01b420---zadevodude.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b263870ec9---59389157306.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/52b03b021713935b32ed49f66d7999f3/82468938347.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/12829506890.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/37455702724.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/56030104562.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/78803881494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=data+structures+and+problem+solving+using+javaPDF 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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 11292 bytes
SHA-256: 873364af69ee5ba340f17717ff280e53deb8fcd133db2c178dde71c22e7fb9fb
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 17228 bytes
SHA-256: 83e33be7760d2dfda5f1830f4a1b549c3c4f3d4fa25f4c5daa036723c874f723
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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