Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f364a90a1db76…

MALICIOUS

PDF

127.5 KB Created: 2021-07-15 15:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a6845c6b013fbe5268413df5fc95172 SHA-1: e94860e92046931c6a0451488e6a163b05a9aa9b SHA-256: 845f364a90a1db760d8bd27a5c2bc2ad997af94c2034711c8b571bc9fe242c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of numerous external URIs and the compromised CMS upload link farm heuristic support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cb2228b1---98978910903.pdf In PDF document text
    • http://immopolignano.lu/images/8568444826.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde32cbcad---34044138602.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/wonesim.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/13500192791.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d94ab1f5---76519180085.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/45424010953.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/tapalunubivadoveruvageg.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42460195785.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kg92e8blsqgb6spqhn423lguae/mofikanisodawulutisagin.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jifinasojagebebavubifi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4amj3sj2ive3sctfes1au17mt/39812577309.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/zowap.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/upo91b2n9f38sed4ir487bdj4k/41172411526.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/48299985692.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/21995391133.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ffb6162124a655c2899717db9442026c/memobalelubodef.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/89605157979.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210703_76CD000714FBA3C5.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/316a3d0e76336b8e1218b969efc0c183/voxobapajuvasela.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0eece0551da99e74be8399ed8daf29f3/46659031685.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tmjk7ns0dfjg4177n0dlns750k/teroreregujutelo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/potejonukosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=friends+with+benefits+break+up+quotesPDF 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_off00018ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBE 18096 bytes
SHA-256: 588b11c7e49575a728aef92d9f916203a99ca1c1fa35b32eb279c2d89de2eef2
font_01_sfnt_off0001bda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5BB 11092 bytes
SHA-256: 9b7249ca9760635fbd856137ece5d09ce0d2ee21d74bb93197c0a9d0a1c4c1d1

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