Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1367ea7b87432…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a5f2408968b862c70526f46ffb2a766 SHA-1: 19b836da37d9a5377dfffed9f58a49e9b6680769 SHA-256: dcd1367ea7b8743258810799bb8a9a53a6fddf3ce117cd1f53c2999c6131958b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common vector for phishing and malware delivery. Heuristics indicate it functions as a link farm and a callback phishing lure, attempting to trick users into contacting malicious actors by posing as a legitimate service. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • 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.
  • 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 http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/24916125638.pdf In PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/7016453421.pdfIn PDF document text
    • http://skupka54.ru/upload/m/zegowepi.pdfIn PDF document text
    • https://renewone.de/files/sedefopuzogodobi.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93918620896.pdfIn PDF document text
    • http://fohow77.ru/upload/file/xaravitimorez.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/tanowiweg.pdfIn PDF document text
    • http://enkepharma.com/upload/files/jonibusubejewivabufomez.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kodaxovibog.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/79070931494.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kanexosumobakodel.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34d1090c1---bemezipixuluginuzetobowom.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/63173796709.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/141344251096.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/29207158720.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/52923913826.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/75598882238.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b487c034c---rovugeborerinafonujo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/6731326721.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/nojafaluvaside.pdfIn PDF document text
    • https://successalpha.team/upload/files/74524385416.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bebe8a6ad---xugodugumatixin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=avsar+app+avsar+appPDF link annotation
    • 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 9700 bytes
SHA-256: afeeac8a83d17705b1bbb72b3644ba0580a85d0529910c6efdbb2b8be6e73952
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 17892 bytes
SHA-256: 3185ab87f2af0f7e0f26e012aced7226c76596ae7d7b5532a94ad8a105d0a1c9

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