Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b3ab32912ece0d…

MALICIOUS

PDF

94.5 KB Created: 2021-06-25 22:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 463b5003467696a8485e9ff172f52be1 SHA-1: 50984a277171ffdafe6fee31f8dfe044a93a2a40 SHA-256: b3b3ab32912ece0d0744a09cd893e2742afab18245bdb51e59824741c660c894
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, with several hosted on compromised WordPress sites. The primary purpose appears to be to lure users to potentially malicious websites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crewmak.ru/uplcv?utm_term=dragon+ball+legends+how+to+play PDF link annotation
    • http://zjqzzx.com/uploadfile/file/2021060308150573499.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607071134db3b---zipaxodalitevijukasuw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2fe2e0a3061b7b56b280a6ac5e7fbc79/falamoxopujepi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/waxatatadopukifejoden.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086718242f8d---23183888325.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1a74b8fd5---baxakifagat.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/megerajuniripik.pdfIn PDF document text
    • https://tavio.ru/files/file/xufiwanibijokibik.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76b1354a7---fovekivokivujow.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb0dabfe0d0f9a85b4d83403f6ce0abe/43071582581.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/429a7f1075cfcca84e4f782922e98560/54811084854.pdfIn PDF document text
    • https://nada70.org/userfiles/file/56100517018.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/15325308531.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/4226481589.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ufkmthf7apgp99h4a7uq2q7oov/vapevofatoxurosovupek.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a7996bebcb1f64161dbe3dbd37a36c47/78907872627.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e477d478---vowifoviw.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/70455207610.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6044aa9d65---90128120121.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pozovuvixoduvokuligino.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19d0e9487---10874954448.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/lopavukebox.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce908b70dc5c79773a42a650dddd44e3/14131988944.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/33813899098.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a4f2e27a9ecda62f2107a51891588cf4/57638274734.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 10920 bytes
SHA-256: 8241a9eb8b775fbcb64bd8a7e2c6abcbc21592e6086f95bac0fa7aa0bbb994d2
font_01_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 18136 bytes
SHA-256: da043a2ae4d0eea0bea753617c4e40733c0bc31027f471083d8292bce401596a
font_02_sfnt_off000145e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E2 3072 bytes
SHA-256: fb211409fdcda0b76ef863396fd94dfa7cc8fc18b25d99d74078347b61a2fbbb
font_03_sfnt_off0001523d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1