Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ed8d233c5409d7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 04:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5949629f7c1714585893a5c455e02697 SHA-1: 3a1bb52102837a04495c9fed89c5642d1a5b0c6b SHA-256: 10ed8d233c5409d722da10a0e5cf65536221d8b76da7ab200e1e867eea38fdac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'personalloan2u.com' and 'akrmedia.no'. The embedded URLs suggest an attempt to lure users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=how+to+force+play+store+to+update PDF link annotation
    • https://akrmedia.no/ckfinder/userfiles/files/dedusafofawukefugevutipej.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pajoxipofuxemader.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pigivigedidij.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151141e3ca4d---6063402985.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/8308400148.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/6215820118.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/nilewitupoguwiwogazofa.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5e6hn2ipa6merihi64bvtslv24/87771468152.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e694b6d65d6466684e117e9141d49817/rofejefojizewemi.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/22909061106.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/wafezefek.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/87197769761.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210926_7BF6EEC5F3F8880C.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/22948133146.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/baderuker.pdfIn PDF document text
    • https://activepymes.com/pub/file/dolotiwe.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/19837783996.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/bekanidifapufawi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa59be3f---88061971106.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/4179605205.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/depijipomenitabemi.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/bufajazu.pdfIn PDF document text
    • http://ombs.ru/uploads/files/wugubomejaruf.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/11123039563.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kirenenodezukaviso.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/walagoganofo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 10708 bytes
SHA-256: 7229a8cd868178bb47211a0191aef267fe1411b80d88c7fb59032d7aa643daa2
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 15284 bytes
SHA-256: f866af0bd877ec44ad01590d93a8c08a381422f29c4af75a45f067eea7a4caf9
font_02_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1