Malicious PDF — malware analysis report

Static analysis result for SHA-256 b048f5f13b41ccfb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 13:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f57be4f37e7de71fc861f3acfbb67be SHA-1: 32181f51e7781813b623ce91ff5df5af53fb9998 SHA-256: b048f5f13b41ccfbf11c97c896c6c97b69d2abd101fb489f722e137d6a27e1a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=call+of+magic+android PDF link annotation
    • http://henanshuangxin.com/d/files/kidepukefafuxamilit.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/27878600247.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/80400527060.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dca59848---49492131212.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/mukofilurodonovapexevizat.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/16902974988.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gk6r9jfccug5di5op6j45o3n79/kenuzenobowisesokope.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/39849242734.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/jozofibuzolojafov.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/lumazefegajixawotonu.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/1305315491.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/73987240852.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e340c33b8e---57335017190.pdfIn PDF document text
    • http://agro-partner.com/Image/files/pobujezuwaberiratasisera.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vujukuxek.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/retapovomomixuvalepuwarur.pdfIn PDF document text
    • https://tcremich.lu/files/files/88444630506.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bad1cc805---83555238540.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/bolan.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lewixatiwamesezol.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/xiledamok.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/37040843695.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/66270464685.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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 10452 bytes
SHA-256: 56342216e663eadc65414b2c7ef92f24fac3eadd271bcffd6359203b8944d6ca
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 18056 bytes
SHA-256: b76d34389a13e840de6f5b42996fd81ab72846cfd973af5555f54e2e965c63ba

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