Malicious PDF — malware analysis report

Static analysis result for SHA-256 6987a981db868a81…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 01:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ca056228419f170f007e9399d893460 SHA-1: 1388b74ea4073e26e6358b18889bd8d4aa290346 SHA-256: 6987a981db868a81cae982318b7ae7e257375345f7f5e486607f249ba7e13d56
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous external URLs, including those hosted on compromised WordPress sites and disposable domains. The presence of multiple external URIs and the nature of the hosting suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=absolute+value+worksheets+6th+grade PDF link annotation
    • https://msvadba.ru/files/file/58262067681.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5989a576---fazugib.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/sadosiletowegegub.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210618_07A367AA474C6F5B.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/64300586213.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/gajupamav.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zojafimen.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/pepanuburevaxagogovar.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dd24c8b0---96413903771.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161189cd0f1be3---60223569303.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5hd8o9kr2scep40p7hfjrvit77/40338415540.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/79063301917.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d61ca4268b0---juzixopi.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210724_002853.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202108183051_510202962.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nukoxilunike.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/83736818203.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zebilixoruzikopebazoraguv.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/duwudamofipikawe.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sobebevemiwefubivuvotum.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98765527ee---57942260887.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/75062246783.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/bufumigazazizuxinorarabe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/07b2ovk70tm9ospqpsg1ejcsr8/gajipabepenefasezi.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10964 bytes
SHA-256: 7e287fe5a18ebabd3f78e1f52461b5fa1b8264b17ee0cde3bd6131e90fe28744
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 17316 bytes
SHA-256: 0e308c3f80299ea3f64cd8ee305c1fb4eb87937d37bc0c774cb110d66fe21254

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