Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dd1bbde07e09bc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 00:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd620731af37860e397ee1405b525f0f SHA-1: 04d1321c760162fb4f2d2ddad4c1fe174b8a404b SHA-256: f5dd1bbde07e09bcfc0fac93a2012fa7d84b9256faf5e0290a2e53be8da782ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised CMS uploads. The presence of multiple URLs pointing to potentially malicious content suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e8abbd7ff4cca830aa605f39a9be0c3c/ditagig.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a32a7704---8249819250.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/mapasukewamizojijafi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/502caea1f999c2fb1e2a9738f610d993/latomuxujedobogasodowet.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1f902016---vusofezawovati.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/97289545495.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/41195788800.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/25491500948.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/21112802042.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839834b2513---59335555483.pdfIn PDF document text
    • https://appfacile.it/file/nogovobamoraxikuvupemuli.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082618de2f38---xogasetakasududajitubovo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c84ca4d5---4749503160.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210813232758.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/jefegemamoroxat.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/18017226361.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74776f04db---posuputaja.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/da9d327d72af2ae325f4f452be18546c/39051160248.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bifopo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a278e6579ab---ronujabobapenub.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/74752851857.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/sufivarib.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/18108362204.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/97879333432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fuzzy+logic+washing+machine+lg+manualPDF 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_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 16788 bytes
SHA-256: fd113182918e91331bcdbfc6f51b366b266a1b670db1f71f0baf7e4b8373fbce
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 10816 bytes
SHA-256: ce6cf798b8fea54cda56501325a5480eed7dfdb225e2cd5cdf0be83d19bd9dd5