Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16105985669efb3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 19:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f3cbc04a0111fbfc4e64fa0b37f55e6 SHA-1: 18477ba50c42508583c27a4a91e5e6b3718123af SHA-256: d16105985669efb303bcabf387049afc7c78712d4ea2613b5641dcbeda9dda3d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of a 'Password-protected archive handoff' heuristic suggests it may be part of a multi-stage attack designed to bypass gateway security by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aven.su/userfiles/file/25764658297.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16b205236---16347619687.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/xobumafoxamegasekewoden.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/baxelobopuvo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/vukowizedegefefezibudil.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jekut.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/683a5229e9d7e66e6ddf54437cde052e/sexizinasetasaxixegelofo.pdfIn PDF document text
    • http://recviem.ru/img/upload/46387952431.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/23354068289.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///potusogit.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cadb38c51---68757397494.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/reralirazijilejux.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a943ac6dbe---76608209129.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/10222086830.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7a0afb4c75f85790b66f52147cd6d1c8/dulitewewexifazurazozil.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c12402f54---ziladajabodibovadepepuf.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/92842286928.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/48851793681.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/87735936343.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/55862359730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=game+bots+mod+apkPDF 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_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 16776 bytes
SHA-256: 9a46e89a12de97e8d08a04eed4e9c3b6af2200a07e26865b4a5ceb6cdce7342c
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10480 bytes
SHA-256: a9b3dba16b7a286f69fefbe5767b4451f7e196a527edd14417a74b58e5503d92
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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