Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9c4fdbb88b3a19…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 05:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c9b051bc9e081aa29129819de6b027c SHA-1: 01dd9b73f723f9a77abb39ff47860e077774474e SHA-256: ad9c4fdbb88b3a199118f7803d1e6129aa3a48b034edc4bdc6073489958cdf87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions or redirects.

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
  • 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://ourlady-schools2.com/userfiles/files/51529129512.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/46203491159.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pudarokujaxudofo.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/95132217495.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/29756918696.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/44534354878.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130072982370---92119823236.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kasopojodiregovukozavegu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/24729965944.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/luwesapibe.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jamafogimemiseda.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/sakipevokikoxitupim.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136615f6e52d---48238820251.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/bavanufegus.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/nuvepibuvukosudo.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/51206784190.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/80860345170.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902055001.pdfIn PDF document text
    • http://thepducphat.com/upload/files/59631107695.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/mevaxosakotapakituf.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/53749631006.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p13i3sn7vudbn5n3vrri0i1qg4/6555210316.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/jagejajigizuvamovotasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+screenshot+protected+apps+androidPDF 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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 17588 bytes
SHA-256: 7568c6880f724f2d1c728caecdf569a26c4592abf907e9e36c744c49f667c2b1
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10644 bytes
SHA-256: c847c84b58b8395b9bb2a3974e36b46fc51a42f96d5ffd33942ee2c76a853a9a

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