Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e9da87b8a0ed2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 03:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4f78b84e2d36fe885cc88aada5ab648 SHA-1: e71233c9cc73620400f885b2382762035b0018cc SHA-256: af1e9da87b8a0ed2b90420015111ed878f114e26786d59bcca665146a4540091
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, with one URL specifically mentioning 'apk para android descargar gratis', suggesting a lure for Android malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=apk+para+android+descargar+gratis PDF link annotation
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/tebinobududifikovule.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/70977235270.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/nitumiwavelina.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/ramutasosonazeni.pdfIn PDF document text
    • http://gr-chem.com/upload/files/61950366241.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/beguxupewuwixosaw.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ec176aab---sagukejosabeminitino.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c114e7e7a---fudivuninufezejaw.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/43566110793.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/sesozutawuxegoverabi.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/93088650256.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofavebigopuxirefitowo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/47205703979.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fenizomug.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zoxijokuxaweraz.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/57836418456.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912185848548.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e147c0a913---purifivoreguninufuzulu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/wogabedonow.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/87074236873.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gomogefu.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_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 18112 bytes
SHA-256: 7012c62ea832611fca7852460ca20a7f576b6f0b785c3054015178e33aff3c34
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10716 bytes
SHA-256: cea19f80ab3a6fddcb5917c65805ef213a374af34d1fd0b60884f81b912bfffa
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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