Malicious PDF — malware analysis report

Static analysis result for SHA-256 699f2975c1032566…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 19:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89e095aa1a717eed53f8d6e9f6e9e143 SHA-1: 2c590a3b6bbc826c4c954da564c5a21f7066caf4 SHA-256: 699f2975c10325665f4c8b1856fc46ceaa55bddcf33ba86ccf683e64dd8c3869
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ssvacancy.com/ckfinder/userfiles/files/porakidozoxo.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/44520035457.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/54900810753.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/xedagalif.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef295d66cb---55729582011.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/38810087003.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597f9991fc---94574163601.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2945921e8d---xovabema.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/64578642761.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111d56fd79---95612127518.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099943aac266---88111933477.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/8843632654.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/74302462808.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kulupupexopegisafaw.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/28/suvezasibopirabuxut.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dac02416---45063808213.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e00fb80054e5510c8627792fc6767d2e/fipazaxazubam.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/52235118103.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/12210437591.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/benisufazi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf281347b72---dijozuleluvazokufemamov.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847fd4b766---wokokiserafekolejezijone.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/61030148970.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb709e80c---88759397420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=les+pathologies+gyn%C3%A9cologiques+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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 11268 bytes
SHA-256: 1a5652c67a3161d3d5b28dfd6498df3a884ce376c332a1f4f0ee7504950abedd
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 18204 bytes
SHA-256: 2191b91a3f378f479ac9d4610481c598b21ae490e6e06605996d287890fee1cf