Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc3bd1603c6d0ae…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 08:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1785027cec6fcfff87bcdf50f66f2344 SHA-1: 505766e9056b8b64429e6c58ae5a5725a1e96d5d SHA-256: 1cc3bd1603c6d0ae7a657d8f5003ba6fb9490484ebbedb38a7a1d4281300f943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://siamsnail.com/media/userfiles/files/2187410062.pdf In PDF document text
    • http://vip-cond.ru/userfiles/file/gukigijof.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/zirekeda.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1dcd0e49---89178968501.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/iu508ka20utu0tu27ahmm4vejb/70024527343.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/mukamorip.pdfIn PDF document text
    • https://designclarf.it/file/guwezezosurijujunazit.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lebijenobikijuxamovadabe.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jogaparazefol.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134543d98c16---dopajudozito.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wabiguwekefegak.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/u0n02gv3c44udfgs2te41rfv8l/retaliwokuxonepobilami.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zivujiwotujejexi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zezofubizesowuxiwedaz.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/xisugaledifadepiki.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10485346610.pdfIn PDF document text
    • http://atrsara.ir/resource/files/33506632076.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/kefopaxanuzex.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gugowopexofu.pdfIn PDF document text
    • http://rapet.hu/files/wekonegomukelobugaxib.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/33364180352.pdfIn PDF document text
    • http://vecsecity.info/editor_up/84094227500.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112a81069b---68016325186.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+academia+movie+two+heroes+streamingPDF 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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 11028 bytes
SHA-256: ed569daeed232d97a9c512b163b658da57286532a509d1882d333d4ca585d2f3
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16492 bytes
SHA-256: 48ffaf1c4cea96dc871600d05de606a2b5e11a08dd32572c2ef6faaa9193f247
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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