Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba903ede7527e580…

MALICIOUS

PDF

120.4 KB Created: 2021-07-31 12:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7c1672eeb7795da168429d1c47f4c3a SHA-1: c3fa47bc34732a814d30c369d2ad0029a25013d2 SHA-256: ba903ede7527e5807238a0f00194d57d6602e3deb96fc8721f69e8c140bb3a78
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into downloading a password-protected file, likely to evade security scanning. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://igruppe.no/ckfinder/userfiles//files/gunal.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2691aae---98861599659.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m7rnc7fvba4jj4j7ppbpa0pph5/kexemedepob.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vokuwoxojesu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/bepubatibifur.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/rezekapiwozasu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pe3v5rsomb6unda68mvl7vgg07/bupuke.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021060909290373499.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa972b20e6e---zetaponeguve.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/53132188523.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce01019a5---pupusaju.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c9fb1da8c901760abe4d57b59989b3c2/94661712492.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc97c3e6d---ponemowos.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/nogegifag.pdfIn PDF document text
    • http://splogservice.ru/content/file/4607042114.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1d60cfde94543c01ce83dfd656ea375e/16071420627.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tukavu.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/porozaxosofakagak.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062217091946.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/436v4k6u0136pmucrjhb6pi8b9/43186514912.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0d80907---34975545155.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p6kvp4llians5lc43cbb0i1ere/dapofuxivenolagozilimeron.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v24nom4eekf6j6q0519qq7r7ls/mozode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lg+frp+tool+crackPDF 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_off000171b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000189c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C3 18628 bytes
SHA-256: 066a8a5b7cdd48e2f277a5ff38621a6a25d899cfd2514fe230ca23202a5fc9a9
font_02_sfnt_off0001baf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAF7 10208 bytes
SHA-256: c0b6eb43e7c61edd80d0d434a251ad7da98b01743bf3faa63f2cce0fce4fd998