Malicious PDF — malware analysis report

Static analysis result for SHA-256 1747369bfe77bc4c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 19:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71f7e3eac9a7cedd2948087665e874b1 SHA-1: 56f84b8534cddb4e2aa3a9610fe8e6038c8690ba SHA-256: 1747369bfe77bc4c43ed0153f5e9b88ccf0e2660091df6a9f342aa8fc82b69a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded URLs. No scripts were extracted, but the document's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=subject+verb+agreement+worksheet+grade+6+pdf PDF link annotation
    • http://euro-ex.net/images/blog//file/18460171972.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jeposedoto.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4c02c07d0acd65395ae4b46862f55710/59116562578.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sogozabulazefaba.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/73119846191.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783962a5ae5---vutizo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/94f1109ad0fd510529f5932ab855a606/3178459512.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8aa526fd---43853671519.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/04e962da9b901f626ab7dbd93e81ae3c/xekimaref.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/5333503226.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa9e0474---dopusigivebivo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a7d3c89b---10368848090.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sf5ubj59j9noaos2jtv36kke80/70865328933.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/79475939796.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918ec05cfc---72945206357.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/fekorelujofikikodawamego.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11f97af66---xopawisit.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/38545116831.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/edq5fdgraikc58ukch2h6ujbv7/94081147227.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/rovomilas.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/dufukabosolubujurigun.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/40168915209.pdfIn PDF document text
    • http://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rajadunalowa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00b4543fd---fexefaxiwi.pdfPDF 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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 11788 bytes
SHA-256: 2cf18bd755c9b45983ada111111af6620be0b3bb977bf0db66686666a779feb6
font_02_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 18712 bytes
SHA-256: 3c9f57c4f5c27b5c1e8dece9ed83b36d9d3f446281020a7e690d7bdc5a47c835

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