Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd546f2751d0f34…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 23:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09b07a912baf3829fb6e837c5f112ab5 SHA-1: e19ecaf1665c14144ff47cb63ba77f1f4a6a20ec SHA-256: 2cd546f2751d0f34b66f69a9d665ee376f4c9a61f016dc552dc64ee8b34373b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and link farm characteristics are consistent with a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0cc202df---26973339807.pdf In PDF document text
    • http://cosmic-kino.ru/sadm_files/koruwed.pdfIn PDF document text
    • https://greenvision.vn/hinhanh_fckeditor/file/xatowuwofidakakadewuza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23089c25f---sexuditajemolaw.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/popigidijanakebupowide.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f603379a---48272023588.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc98cb8878---34332569739.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/813b0af3c6f9b7153deb5632b30f85d9/vejavefulewek.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/buzur.pdfIn PDF document text
    • http://pasaru.com/upload/files/vudeviguzuganasaforagape.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/ziniviwamukawivijukal.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/rojegatofozewesasaf.pdfIn PDF document text
    • http://learningkey.org/userfiles/nuwokunufumofuk.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9a22cece33516fd4ad9743e194ff9ba9/19132842458.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079d1a317b---nifidew.pdfIn PDF document text
    • http://rapet.hu/files/bapimomobozojidapugigel.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb16d81cf7c---xojebiwexa.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/88294148618.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/rilanalilunur.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/niwesew.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/45553053077.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/85116666362.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/henp2fvg7big8veofkpeaeja97/70861074247.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/sudavobeveb.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fab42b73b44---nekixizupitovepemalez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reinforcement+negatif+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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 10796 bytes
SHA-256: d269b88710348af1698bd23ec11a4ef49f97c646126b7da69c4d241803b58efc
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17100 bytes
SHA-256: f905855ae4aa01ce44f86d95d6d847deeb0f1a93f0e869ac912c09142392127e
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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