Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdf153622e41da5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 12:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4829a9d83c09df798f13ddcde5bf8d01 SHA-1: e50d9b4bb0c84d7fa3b3dc72a173aa6a6724ac2c SHA-256: 1bdf153622e41da5c5073e00d92c5c4eab4c4f995cd3a7101636776702f13309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=fire+extinguisher+types+and+use+pdf PDF link annotation
    • http://namuvaldymas.lt/userfiles/file/19007496897.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m6s2hcttodvavff7c62aofqdl3/80846211047.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/34021409389.pdfIn PDF document text
    • https://badrivishal.com/media/71127648415.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/94036314908.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b842022c13b67a509b3bb9bc7f86bfe6/giwuze.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28690637939.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/dunuze.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b4db5cc5a0cdde0734ab3130745b528f/lewopemi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c993b5a9---xiwawolumebut.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/gajusopolife.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7d21a98392b79ba60743a38f41a6193b/memixaxemop.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/tezojopoputipi.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/sejenofajopudarajivumub.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/zerukadodunilixuzirigew.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/89873180896.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e05066b27---6076729939.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca666e25a5---vupasatofama.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/edd36aaa56b12a4fff3926bdd5143a00/77187759554.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/25603234898.pdfIn PDF document text
    • https://cristalensi.com/public/File/80272460487.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/af89e71ab9bb3fa86e9931bc33778a40/7754032250.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cmf1it84mb4udftqmii0do9cl7/10955231239.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/xegonasabi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb19ba242---rinukapazogi.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210718201801.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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10904 bytes
SHA-256: d76639a29af3eb33fcc6c0fa74fca629d49c134c9267eb03467c6e923a4d3515
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 17396 bytes
SHA-256: 3138c0fb467937059eb7e5d3795cd1614d6fd00bbbcb81d05261bc2ba7caa23a
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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