Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad1cd9dde65ec41…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 07:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbe6e0b9cf7a8c65ee706843708d2d11 SHA-1: 8f5e6d65b3063532dcc5f81c2b3fd074656f2b8a SHA-256: 1ad1cd9dde65ec41a546116d4b8f9e91a41048a6abcc3a6f94fb041ee235bd48
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bdd140b54---jifolipu.pdf In PDF document text
    • https://daquin-ferriere.fr/userfiles/file/45513094734.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/nufuludanex.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/fizepaxetavuvenebot.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b57bd3c7f00---gusosafezalidefir.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/86491682874.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248f955097b---nelurolitoko.pdfIn PDF document text
    • https://digireg.cz/upload/letewipu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8qe889asnjsaf2f30hvnv1jvg7/84390354261.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/3797590889.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sadapedokaduri.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/zozogowebitosaronivaj.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/gixemazimo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2e11afcc9ccbe7ce2ae1f5aeb3ac0863/kuxod.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fusasejufaxijide.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/87981624067.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/938beb866a659f883fc507bd30905132/74052959544.pdfIn PDF document text
    • http://ahchala.com/img/file/zukawezeta.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/53039051749.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ee4af6f0b2cb6386bf5ac9c0faddedfe/wuliferikeluzapezus.pdfIn PDF document text
    • http://zuche0551.com/upload/file/togisakuwunevepoki.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/72896793609.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/79069665618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=advantages+of+absolute+monarchyPDF 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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 17476 bytes
SHA-256: d0e67d0f5f18eb9543ab8e53a7ff769aea0279a8d85c576bee67468a33b911c4
font_01_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 11232 bytes
SHA-256: 8ff89aae761cb9e8dff25f8f2f84cdeaebd3723932aa849cb69a75a76f712d58

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