Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc27e977f99d8bf7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f6c62e6f6d5fcf273d3060d93875eaf SHA-1: 01e52069a32e60a00549992e85ae9195900aa95d SHA-256: dc27e977f99d8bf7e3bc7f06374579036bf795997849f5dffbf112690c525eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal a link farm structure, with many embedded URLs pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8cad6450f---7967176881.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2301950fbbcbb4e06c052eb01d38fbe5/86682903230.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753e31c9949---78855712306.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/uulhmh6tf4mllg9rkss3tjc8r3/24764260665.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647515d800---51717256076.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/40087493912.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/98399641344.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bbc2237d---xunas.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4590ba12dd---486015056.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/78425818900.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/30704335707.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/51762974297.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/30929370270.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/gavedoxikemupumogipom.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/49617289828.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/pawepekajo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kezimamerivetubav.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bedf55740c19687f8898156b601a1459/muxedetezesapi.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/nemigoboleraxigamixuz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cff9bbbeaf5---mifuwolebona.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/37012857116.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1ea6467b---tawisaziv.pdfIn PDF document text
    • http://tipiland.net/upload/file/82624416069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+i+reheat+an+omelettePDF 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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16844 bytes
SHA-256: 12046eaf00e83a0a000ce7f411ec045ef5ea58dbead20acd3d02e56560676430
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10236 bytes
SHA-256: de5186ba65baa326a59298a26790b581bd4ef3f6abad19d5f8100103d0e0822b

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