Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef15590f6cfac1ca…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 19:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 877583432a29a5a333a88ced0b306c47 SHA-1: 0f5fda7d69427fb85da1ce0275edc73d9a379a62 SHA-256: ef15590f6cfac1ca5697827958b258caa3174c1373e9f2f7478ef8857a723e14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=cara+clone+aplikasi PDF link annotation
    • https://hotelmitrutarija.com/uploaded/files/kibibekosali.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb646ab32---vagejewira.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/79851871597.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/bamasiloxote.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/rorepemowasos.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/37544396829.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/numuxuzarutogu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/wekuvawikivusivipowoko.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30815033596.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/32487526554.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/3453203843.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/gagarixosozoxorogewetovof.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/49d9348399dd23477cf5965842c877d4/folojuruguruwepone.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/megaros.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/nunovoserikit.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/reperexunetilisenoxod.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615185da960eb---71133632646.pdfIn PDF document text
    • http://dfanchem.com/upload/files/34112263681.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/munogarul.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/73603622237.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/13855121764.pdfIn PDF document text
    • https://reha.bg/content/upload/file/86844878901.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_off0000b1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B2 10392 bytes
SHA-256: 569f4935d94ce1b7a40ad2768ee49abe12ac745aa186263138d3767be690acae
font_01_sfnt_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16712 bytes
SHA-256: 8d2b157408cdc0d0c29e37bd7b74aa88693424de9f5297120f5a9e0bf9210bbf
font_02_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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