Malicious PDF — malware analysis report

Static analysis result for SHA-256 b197555e78e6b5ed…

MALICIOUS

PDF

78.9 KB Created: 2021-06-30 16:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 738f831079d66425db998ce0e7ea1d9c SHA-1: e21b2aaa08e76435614f70926bfdafb21ed79258 SHA-256: b197555e78e6b5edab3fed1b48f3d7a7903e1aa0ee5a11677901e24343658240
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and the compromised CMS upload link farm heuristic support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=xbox+booter+download PDF link annotation
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/47d9757123b2341a84ac630340c03b80/71666712789.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776961e9c89---sapaboganew.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/715ccf7f632873364f500f7e4e803c4a/66426028979.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f64n8e21romm7po958im9i7u29/wijovesivaxidibudowov.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451430134b---bamatofivaf.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/0f3si2nq8if15jnerrs9pek2tm/45642529812.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea48ae2aa4---duwegiji.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4514f1e8ba6618919c3c7240dc486c13/sorubulubane.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mic1614lccpj4p02221p3r78fa/sawimelakavepijirep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccd35116ef---bavewawol.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i6cpsd809me9hlkpr0p4u3b0r0/meferumerukewi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81c817ae---tenazikudorofebafafazap.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/puviloluzevodojibiz.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/fizoj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aef090775---nisoremafigapugowizokupo.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/3891976640.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ac3308874010a8f4837fc07ec28e392/xuvifodeb.pdfIn PDF document text
    • http://emannsltd.com/userfiles/kemokolizota.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/16193500716.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/44952010098.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/zomoponi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/85154303930.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9abbecee---97639927986.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 16696 bytes
SHA-256: ee479788375e77203c7a66beb0325057d7efabcaa291f514c60399760b485f71
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10316 bytes
SHA-256: aa3a9d6715098a8a2281599d5f92a1723a60ebedf17772c332d897d395071beb
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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