Malicious PDF — malware analysis report

Static analysis result for SHA-256 18da21317bb6bafe…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 23:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f127ea998501cd7c1319db40883b0eaa SHA-1: f6bd75c394696de687c58d17277eadfc38970100 SHA-256: 18da21317bb6bafe014a04c103e93ad9ee5f81363075e0f4ec6ae29d23b2fcc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate an attempt to obscure the final destination and track user engagement with the malicious links.

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 https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811d0889fd---59762993740.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d4d3606---86428585693.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d0759f6224bb09b0fb5d9b7fa5ac33fa/bozokusinejoroxaf.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/25461493982.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/4005843518.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/wumejudiv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160946544c7301---sibifis.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3252b197ecb39f14e5b0c81ff08780d6/bipuv.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/23d79d94c6fb062156272707f82db0e2/25710014974.pdfIn PDF document text
    • http://sciattella.net/images/file/dogag.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/20918506292.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4c13f7277e2d67a8e67d4072344ce725/52986303780.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3ib9dpqfj9uitgsq9354it3d69/gutotona.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff2450592f---kitodelagosepane.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210811050314.pdfIn PDF document text
    • http://aa-nusd.jp/81811179825.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/orcnutara92vi7hi5sd9pg38gm/gometuxefijuvegixekoja.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731033be9b0---53733483973.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7fbe6d111a780fc6da135c8de8e81ea8/34938924170.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/moxinowapipirilopod.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/77064260703.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lugepanuzafimosut.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/livivuvotixavodezuguga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clinker+production+process+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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 10672 bytes
SHA-256: 3f7a8f3e8dc46c26c976f39f2572c3ac2d9a9150256496798a00a875221076c5
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 17960 bytes
SHA-256: 1f8247b67db96744a2b9d900a9066b4a69448ecf8a6c865a5294011ffbf742c3
font_02_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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