Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4b03478c22181c…

MALICIOUS

PDF

117.5 KB Created: 2021-09-08 01:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b7b138fb3d53a310c1c8b6a4786bb35 SHA-1: 83187cce8875e4c94bfeef01d7a42bf58ade0ad4 SHA-256: 9e4b03478c22181ce8a59e8bb96485b8444bc75909b89277895138cff0ed68fd
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves leveraging these links to potentially deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artpolyclinic.com/file/files/negifekanuxugiwexotupo.pdf In PDF document text
    • http://secohthailand.com/file_media/file_image/file/27807923268.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9dlioum58tttqc322b2856c0fh/53038818327.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tesepavuziwuvazopebodo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/fozutonudenirar.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/65a2e07c1867a445460526761a547798/130936549.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/96996959653.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fab3620a8f61dd9f6c9072c56357cd32/sonigobixirul.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161277d370f234---87246444905.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gipixukepelasifu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be7454e2323---ronafigabal.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6777d4bebf05c97a16ed171113eb2c25/budavojagofigejopizijod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd0b20e6---pubuzopitomuj.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e2758a4d---faporuw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ecc37ddf9d242f2e1dd2fcbc60f00f3b/demepirilezuzaluxi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/1960782059.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/72b40ed97a4bb0f29d207a929aebf627/lodatomokowupadifewejoniz.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/13782479838.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/70469254490.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7907595a---38419631525.pdfIn PDF document text
    • https://tipresentoio.it/images/file/28106983266.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d748510d5---51653277710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manual+de+partes+de+una+computadora+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_off000161e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000179f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F3 20816 bytes
SHA-256: 9a7ad59a23c21847535f41a8264cb3c1f92888a130e47317135713720cbf9c66
font_02_sfnt_off0001af0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF0A 10780 bytes
SHA-256: 2b2a8312987fe1f57ca2810413ebd7daa3e9c461adae43468cf6477b60ef3387

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