Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c47df1c63d251b3…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b61f82057774fbdd18c421b8b5dd937c SHA-1: 5322943930cd92b76d4ba8c859f27f5fd029d3d2 SHA-256: 3c47df1c63d251b34dd8cd191ddd902016bda0b01c1b8db4cd42e05e1093a29f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical of a screenshot used to hide clickable links. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.saletime.gr/admin/fckfiles/file/50750461601.pdf In PDF document text
    • http://tofuyatogo.com/uploads/files/zidinogeperonu.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/domoweja.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/79470153152.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/63740396830.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/wikabuxudidoxeguj.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70863335596.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16156404614d0c---kajozafuwebewimojarid.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/vobemitololamejanivamuma.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/3059675276.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/53218048164.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/latimigubipolav.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/kitusugoresojevemefonewap.pdfIn PDF document text
    • http://partnercable.com/files/15559896218.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/garideb.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/83856942309.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/kolixodigedalunifag.pdfIn PDF document text
    • http://air-con.ru/upload/files/nevuwevajezigav.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e0bf41f575a7eb66363b51eac6290ce/58117098106.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/87599925549.pdfIn PDF document text
    • http://goldia.cz/data/file/74972831923.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/951523896.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed39ac6cd9---musiwapik.pdfIn PDF document text
    • http://zzweien.com/d/files/perasapizu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6cfa77612f70f95ad03a31d2989d6ba7/katedexajusisoxinili.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2bf23bb2126456146bb4884b93dacb72/98148759351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=audio+video+quiz+questions+answersPDF 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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 14308 bytes
SHA-256: 53dcdfe75127640bb69109a66f8a387caa415f51b260242cf4a7648a7b5eba35
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10632 bytes
SHA-256: 7cbb8d35f0025c8935fafd0fd5fb93ebff0955da9481f8482dbc02c5e756b45a

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