Malicious PDF — malware analysis report

Static analysis result for SHA-256 7645524a467d797c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 00:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89d6e1b9247b350e6ea68f8dc8d732ab SHA-1: 6721422a4d3d7352eb875dea42ddfb6a1cfda67a SHA-256: 7645524a467d797c6cd1d7e072c671779a9093d67c9cac2ecc2bfcaeff306e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious content. The PDF's structure and content indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=characteristics+of+business+research+pdf PDF link annotation
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/l1egclu9klcjkps5m7mgs9g9rt/girobarabilezimiburor.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/63730149542.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861a6cf22e---96530720925.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bigopikobupusevute.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0ea6ed5fa744a0f6e94eb94a6e84eaaf/lokuseroseke.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/97528098162.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/tuxuzisigezuxekapiwoned.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eee10724b---jitelosotuzurogiri.pdfIn PDF document text
    • http://rem-proekt.com/f/file/pafoburowakitexofix.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/17060280604.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/51588194973.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/wokugejonikakoxazokaror.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070485d8c88a---35812213950.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112728f0b6a1---nojebaxekodam.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/likowajox.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/wisizonojit.pdfIn PDF document text
    • https://turbooto.vn/upload/files/62780261958.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edff98c1c69---78278017624.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/21621967457.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6425df8ebcfc6367b381b54770ba313b/92663125171.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/mimetizabuwusazefomurefan.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dagopelavanebijufowe.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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 17636 bytes
SHA-256: 30b2c928dd875af5d4975a6d123fc5043a6272f58d958842b5aa40575f83cd3e
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 10944 bytes
SHA-256: 7b890767452c0c857a528b4adbc2219bcc522010b60011e6229edc13a7ce166c

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