Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c8a1eebe6ad5ac…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7a0f57252fda9012c1365916ae99d02 SHA-1: f5b82985fac03a16badc15985bf3d19779e94ac2 SHA-256: 02c8a1eebe6ad5ac0c2f82cf5e4c09f0fd11cbba909f37ee2c21ee21ab112f50
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'Fake CAPTCHA' heuristic indicates the document likely presents a false verification prompt to deceive the user. Numerous external URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://pistant.ru/uplcv?utm_term=pokeball+plus+apk PDF link annotation
    • https://www.db-ynox.fr/ckfinder/userfiles/files/84242553845.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jumimil.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/ledozuzunidusotavosazo.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/44870964471.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/10029363a8110a877613dd87e7c6be25/pobajiras.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rqis5gmkuab8v7i2j7no1gabq7/46028316122.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/temubelonaxokunefamol.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nakad.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78366936770.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/56882884174.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358139bc11d---38097953909.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/64070167933.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/40039722866.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/xuxutojivewesuwazukeni.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k0ndg9hkn25310paho87i391h3/sejamawugirata.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/giwoluguri.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/surinoloruleludepafu.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/47524091836.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631813352.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/zoziwexoporiliropubabime.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/mojeluvabikexag.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210914_014642.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2e8b7450---fakudaxaga.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vomamadukolitemebexi.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/bososoregut.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 18884 bytes
SHA-256: da1d90bfda02f676a8474778d2b606dd83d749ef622a4ff3f4daa1a2a6028ba1
font_01_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10184 bytes
SHA-256: 4169b704b1414a577b8ce2085231fcfdfcb9279a0253299124533368b7263521
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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