Malicious PDF — malware analysis report

Static analysis result for SHA-256 a458e7a0bfd98383…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 05:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc55ee22c5ceec750ae7d517129b56ad SHA-1: 4755d52ff7b6fe88bdf97c126dd05c2ba1e522f0 SHA-256: a458e7a0bfd983833307c2bd786a0dcb68524da9951c377a746f8114619aeec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links likely serve as a lure to download further malicious content or engage in phishing activities. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://catamma.ru/uplcv?utm_term=download+battlefield+5+android PDF link annotation
    • http://mlsconsulting.net/cms/files/File/gajitenokut.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bc97c61c---kemitewigisoderowodilewu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f111d88b60---wejalafolana.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///8985890215.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/44949800281.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/xugapuladalagemuzurujagod.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/gepivitum.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f840eeb2a4abe7d7ec18cded549b88e/vigukibijoposejiwedono.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3417380a---newol.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/38523804409.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nuxoguzarizemovixugiwax.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wusuzevizaruwek.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/8edeba017fe389383c508b97f30a9fc3.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/6323663135.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2b78d118b504b2386e6f4fee042bb8a5/18064881322.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa62944f1b---92696724284.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/66424786671.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xoseret.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/viluji.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/90732988142.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/mizenufemoxogalage.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c3dd1b06---pofezutuwurasodagap.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/vubanisifiruzepe.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/vanikuf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ratewijomuful.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xagijolidulekojimaxejok.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 17468 bytes
SHA-256: 2b7310ccd218a29eb0c8751da6165bd5dfc0efa9c9c9ec64cc3710bc71957776
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 14648 bytes
SHA-256: 8b835f7e9b6116502d68ffd12f5ec9b8d8046063db534e743345833eb459d632
font_03_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 10540 bytes
SHA-256: 220d01dd4295acf39e800f091d1858f009cbe33983e5f2e618ad5f1481518418

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