Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c6e295d278de5e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 09:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17d9853ef0477afd59d827fea1d32541 SHA-1: 8d8869fad18d0b6a8b0bbcb4e8774cff94aa0c8e SHA-256: 13c6e295d278de5e512b53dddedc4a0121ffed90ca2f5201efacaaeda6c591b5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and the structure of the PDF suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://keitbg.com/images/files/49755736339.pdf In PDF document text
    • http://cz-synergy.cz/data/file/zilalabepuxejalal.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kunivuvo.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xepaduridelifosafipin.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/87508478544.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/im0sl8cf4n2ncg8uplhnovsg52/95557856039.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f38c192f4f---62857181380.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9bdcc6fc---kiluwunogagamojufepalefu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8eee00d0---70879733285.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/59307473831.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fb3uv61vipbnqhpf66m5tkphc3/36425507013.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3920pu45et4tpshce4orhn21sj/zujixabiferosijezudix.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/723f28fc220cef52b084dbd83e35d4da/setozejagigaj.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/tuvisawufat.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f027031a65c---62679186504.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/begonixixibej.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/kemiluxepunew.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/zoxojelijixitoxawudefaza.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/lowofabobiziravokapomirel.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bedcf2131e9e0fc02aa25a5e5c6fcf55/64706186133.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7f46d763---fuximezatunidozize.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zojuditoregakedume.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/38176714247.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pakotisodalukixonu.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/16425569252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=advanced+piano+sheet+music+free+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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16932 bytes
SHA-256: e5a8a135c7ce19bf034ad90ab675120311a3a4ebb97d9d3425aa19cdf24bde5e
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 10984 bytes
SHA-256: 35eaa1d8371a471c0eca2140a1795106b637a07b3ad2080be2b1bc1037c02a44

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