Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5f1d709c6f584f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a87ced00e2beda3d75f80ee52294a66d SHA-1: 7891e4d2bb00872a4efbe80ff2b30d7b639801ad SHA-256: 3b5f1d709c6f584f847708087a30e751fbe2530d3bc2b0103dd0e38e7fe93780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=goiter+caused+by+iodine+deficiency PDF link annotation
    • http://richmediahouse.com/admin/uploads/file/zivur.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/wisalag.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160801e785ab99---26835859326.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a331026a1---59433069277.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/mirokexisizuduvenikiz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a5f02d3d---jemum.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gewogutegezajisogowev.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/88744910815.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/dcf06b076ce1a37c524e7edf49d6d75e/kamopesoroduxiv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l7nk8lc0rfq4ss2skkrrtuk50r/95217154276.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/semamogoxabivufire.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8b62f48317fa4aa3e77251df22cda989/16122257717.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/68931749049.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/kudupewudo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/vewojuritexubusegomiketu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/91200246146.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f0cda60c---72809170613.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/rozufixevi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vejgo416vdq11446gp1flj0bq4/lorudefas.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/45735332788.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l7ce8ommuergovuhrp91usods9/bejeguwotileji.pdfIn PDF document text
    • http://rc-modeller.se/images/file///subetibow.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cfq1cjm6a2vlg2sehif13eime1/fogekemolajunugedaseberut.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8sfjrldr3rjmt79e2ih0svnhg3/27052095739.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tvq1q9qa7f6rrrnkaag4473j6l/1521136231.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_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 10816 bytes
SHA-256: 932f264b946b51e3a036cf91d7ac7e02ff6d28e4b7c219d72d8981ec65d04d3d
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 17848 bytes
SHA-256: a23c58800661b3b70981ed1d181c86005870457f45af38a3d64171212094baef

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