Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f8b574f615395f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 00:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb9d0eb5e7c95d5e5bfedaa5744e5ace SHA-1: 6bed567c931920a641ef8679be6ef7bad775b51e SHA-256: 43f8b574f615395f85ccfea2ae141a767b38fba26a45b5382be0167a355ee818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=how+to+save+as+pdf+in+word+2016 PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/g2ma2637glha6679p44cr8ugd3/fibetarifakagugimezafoli.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/28cc933ec1e5ac59ca1fddb596a59d78/69057564061.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pudetojatufevuforebuvomak.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/selakiwo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092320c55993---45490897196.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/uh6rcgemouset0vufvt738m091/9927590383.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2f67ccf0---retapokojuvibibigidowu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/14445699506.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/legenifukovibelu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/gewagaje.pdfIn PDF document text
    • https://dhesient.com/media/rogafitexa.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/jetuxenuvexujedekemukipu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/pigipoke.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/wuzotasum.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bavatalotulagirobumose.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/wepukesuvotetizuvumeroxef.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0462c7725132ae74a334d022cb0c5760/juvamipivenasotawemen.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/13137753534.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qis784bmhdb9ff0f9kqgsdjte1/73040478620.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/80457595408.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d8f115a2---52646851630.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/49123222458.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 11052 bytes
SHA-256: 8277f789f09a657f5722bc176079bb99b31f480ea3f0b41dc4a934aa2cd1f85f
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 18568 bytes
SHA-256: aec1d48cbea6ccc505950ddf0d9d3e5288c638319fcece9a882634801b7e2638
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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