Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16f3722d012fb8e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 00:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f765b6aff85135aab9d4a41c85abfee4 SHA-1: a00ea3f51e434f0c7f6370a77d3dadfad6743e28 SHA-256: c16f3722d012fb8e4c157a99e57ffa988683e2191f0092d95179b1487d491a17
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for potentially malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://philabc.ru/uplcv?utm_term=direct+et+indirect PDF link annotation
    • http://agriturismoilnoceto.com/userfiles/files/64170975015.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7674b9fea---43351649491.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/duzuzijilaxajulativagej.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/mujugimibiluvudupowe.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/8061105942.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0883364644---90457500484.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c9319d39---23478307964.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cb3cc50b---15102721389.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/dojimijujiloxima.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072006210273499.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/magipaputewanopuvuzuseb.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127cbe26d062---56780503258.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rezuxajojutas.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d7c23eed---xasidexebajilomuvekolax.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/v12vjdljivqc72mc9cmjv9i3fr/85990461138.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/88005266690.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/p4l9k8e7ckuiq3nj6dljebrecm/vuwoguvubiperuna.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/70250410082.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/147f274d867e8b64a0b422a3ec267b81/23871465865.pdfIn PDF document text
    • http://espokebar.com/uploads/files/10932675150.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hca92u90q1kfr6hkstd82t3191/33990615357.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/22ce9e077e6cea7d126494b2257c1fd1/21479487099.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 9868 bytes
SHA-256: 6e004a94f3cba5d79668dc6f0484b391611d073e345be71cc00c31dce1e6a4a6
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 19248 bytes
SHA-256: f8d2b5117c95bc5ee9796cbca29e08b8940ce837770be0b4b2c3a70c07294223
font_02_sfnt_off00013539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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