Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb1ae538e52f4dc…

MALICIOUS

PDF

110.2 KB Created: 2021-07-20 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e52a0b2984a44e1d01a7285a230ed19 SHA-1: 8e94e50aafdbd7612bcc9476884db5d6666c1411 SHA-256: deb1ae538e52f4dc2692511a3e3167f1f9c540c34c3f384e2d007ac931215c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The file also functions as a link farm, pointing to numerous external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hagepoorter.be/files/files/bexogazadub.pdf In PDF document text
    • http://alituncer.com/userfiles/file/44262325826.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0d8ae3dc---46935274700.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/19415884356.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/56785603728.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0mns5as8tiujbfdm4i8aquv0vm/34226164796.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5bc4d7114---xijilamuxuk.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7sc35lp8inl4r3suvr8e7irea4/takumuxadujikuburemudu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/juwitiwemoxenakop.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160866db2223a1---98797477517.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/89476641016.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/40469234711.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b69d2c2ed---xatejam.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/3055384670.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210702133751.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/10185446227.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995f6887a8---99096069940.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/85558458044.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wivibafisowutojimoxubewe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/78751d524d316a32b64b2ad60e90af5e/28337872736.pdfIn PDF document text
    • http://biosite.ru/images/news/file/nonudafomit.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210608235544.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e3d745c26926d43fe65896f318b6fdcf/75975734702.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c94502f096c---18530222977.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/676649cb8b86da61e479c961e336cbaf/21095084683.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gojuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+fall+in+love+at+first+kiss+eng+subPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001272b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1272B 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 11008 bytes
SHA-256: 7ed4d8469ff564c69f0c5f97c7a46d716d86c0983ec2db041b837d73e8c1b4da
font_03_sfnt_off00014322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14322 9400 bytes
SHA-256: 389269780ec9a5263133dceea199c46559cf2a886739fcfadf4ec00ab8dce55f
font_04_sfnt_off00016170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16170 28612 bytes
SHA-256: 1d3c772f8d3d83b0c2c9f2322d1c6bb5e6038e264e5420b08a0e779c138b678e