Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe3878c72953cd6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 210e065db845d767f64b9e901a8272b0 SHA-1: ebe370f2860c29d609951cf9c721bb4700544207 SHA-256: 2fe3878c72953cd6a624bdbc8cc17f294eab2e228dfeb491241aeaf5429d6d46
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing or social engineering attack. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. Numerous external URLs are present, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of PDF_URI and embedded URLs suggests potential for further malicious activity, possibly involving JavaScript execution if present in the PDF's interactive elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://irlanc.ru/uplcv?utm_term=download+pdf+reader+windows+7+adobe PDF link annotation
    • https://fond.ru/userfiles/file/59055564231.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rabuzovobari.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/1701786359.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f831268c046---vobokulosug.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/relapomiramavaraxipu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/37566555482.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210730_F1F202E9749F596A.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdf6cef43---minoro.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wozipupoxixinurizixuteziv.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/60827081115.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/69589480325.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/3154076616.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc24dc3cd7e---zejegukad.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/156a2341907c983444ce590718840372/59140039029.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///61474544974.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1dacefad6ff53d15e7be5718427df3c9.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/7205954192.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/59788072314.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/qepkrf9ti7pcb4fhttooc2hq9c/56707050363.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/65625050352.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a4e7ddfc---34891873018.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c141771a89---susufopitimidukir.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/salovilowewula.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/jafefetezexosi.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10668 bytes
SHA-256: 569203c56c22d47188840cd24e8a72f7799f9ccc948c639f6168400914d7c305
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 16744 bytes
SHA-256: 4863390e3a67106608e9eb0843e43f9ac112aa32154c72fca5e95c90835473b5

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