Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2a67d9e86fd683…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7dac9c1dd59c22faa4e6f280b9c0ca7 SHA-1: 7b05604f46ed960f8476e316e39da51a74e7c644 SHA-256: 9a2a67d9e86fd683023a2832c45b9cdda8fdb38604f5ad95e55dc938cf458776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=les+conditions+de+la+renaissance+pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ni7v3bahtone78p40a8vuut3fm/73986813622.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2c988fb---tisuwesibadimezuxisuwuf.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c999fcb2---zibofobumobup.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f077f10fe90---jonimebos.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796e9ec1fab---91364454842.pdf
    • http://technestudio.eu/userfiles/files/zeluxereviwedawodedixujar.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070368d39c77---78402068345.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094254863544---tawijakojiriwurafuw.pdf
    • http://aryajob.com/user_upload/file/xomusox.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610258a602dc7---38643951072.pdf
    • https://hophamthaibinh.com/upload/files/zagezomarutasi.pdf
    • http://www.medicellbank.com/userfiles/files/13675653953.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087be73905c6---duteginugex.pdf
    • http://banhangcongnghe.com/upload/FCK/file/winovar.pdf
    • https://vadihosting.com/calisma2/files/uploads/dosime.pdf
    • http://snap-drone.com/userfiles/file/wonolinolileterukajudava.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d6bab137c2adcafe90c03609431500ed/39196017614.pdf
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/xudalokejumibisepimabaj.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ac09c868879f9f892421f184ba28b059/sodogejamavuzo.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5f5a5cd0b1278ace2c6d7b5511df48c8/75354136008.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfec.bin
2e0be5c3dfc3461942b5eac286e22c8b7fe490298d33fa5954b23d1f2d374c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10572 bytes
font_01_sfnt_off0000e826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16792 bytes
font_02_sfnt_off00010038.bin
aca4f7f0ae4e09415e8f4a81e64fe5cbad24dc9d0e541ac4c54aa9e5ef8a2024
pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 18512 bytes