Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e612eb25c619f1…

MALICIOUS

PDF

94.5 KB Created: 2021-09-02 12:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a941d840e4aa9fcabe3f9e8f6d233688 SHA-1: 727d996567756a4c94c9c63a4ea2dcdc1afc5766 SHA-256: a8e612eb25c619f1929306e66ff1370bba2156ea06e76193dfeab79d00051f98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://mindatpeace.us/uploads/files/76615818429.pdf In PDF document text
    • https://zemiigori.com/uploads/file/74368489170.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1070db8562---10671662014.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/pirem.pdfIn PDF document text
    • http://ccshecea.org/upload/files/jaruxonufugar.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ccc5763f---nolidobabikixudig.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vknp4i4agfb02n4cl05u8k5tsn/kixojelojor.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108422c50806---8489210984.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/dipozur.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tovixigopa.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/74204101125.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/97ae2fa18ffe1843d81e4c83eebf068b/rizesoburudibib.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9d10cf5a---37305549204.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/47096775243.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/9219041267.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/79776348285.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/65400906946.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kavul.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210814095616406.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5455d2af9---40298487422.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/lajevafesawarifozubagu.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/85dc45739eecfbc0bd819c8c845932a6/91969981512.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/753677de5bc8f4ae7191c121fe1c2c5f/zabomekig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=el+camino+college+catalog+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_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 18328 bytes
SHA-256: 5978dff94992369082a4b2ebdeb6729ddbfb50a2f5f8b9a01869c85b529b1d55
font_01_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 10680 bytes
SHA-256: 54a427f937b7227d9cf00c2fbf70a52684361b0ef9727a9c53e660c250433bec
font_02_sfnt_off00015486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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