Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c33f903c571fa0…

MALICIOUS

PDF

98.1 KB Created: 2021-09-04 22:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 755434d21a1585007a007c93a41f74be SHA-1: 7c0cba233dddeed2d7ed70afcd2cd14464cad3ce SHA-256: e8c33f903c571fa0fced0b7039e0499bc1e4f071c6cd18e34e022b4c7838636c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://barrierball.cl/ckfinder/userfiles/files/wujejeroriw.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc37c81c2f---55269367893.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/64554767711.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/448110805.pdfIn PDF document text
    • https://activepymes.com/pub/file/39115795914.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092323996788---nujejo.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/pirurizepelunemifal.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gubagivatagoma.pdfIn PDF document text
    • http://budka39.ru/files/laxowipix.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nazisafugoresubeguvexowix.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/minowineporefoxet.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/46146647923.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/18551837143.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/60807404616.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848911dee4b---wales.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ae2d268fd---fatinuvana.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf78d0a6e---72830830921.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/wuxuzuvolobabodoponopu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/43c2959db407ace4056f4f845e9fbee5/nelaj.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vexodisera.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/vududodim.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/26649089708d14d6deeb0105f6e7c17b/bokafewolaworogarusovusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=t+mobile+coolpad+snap+manualPDF 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_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 22288 bytes
SHA-256: dd46730bc86888b3187fc455e11b3eba28c7f8ae337a9b5511e59d2efc6f5617
font_01_sfnt_off00014979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16190 10680 bytes
SHA-256: d699b9b8d7a84a11bad37d61bbe4f84d36d2cea121b52be0b36810f56479122e

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