Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d41f28c5174e2…

MALICIOUS

PDF

78.5 KB Created: 2021-06-18 21:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c2bf392938df4d23b54eaaa9e25f792b SHA-1: 8f4d1311e628802bb0a2481155510b1324322557 SHA-256: 5b7d41f28c5174e21173f477431098e8df952b2bf30aeaae949e6cb9656afc43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially compromised sites suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4274dc76a---bibagosijawixotidupi.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160803aede2da1---zosozitofu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c12565f2c78---tobovesosopudarujanak.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075805d99071---wudenizukeximukowerak.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f71821379---risiwexesitoluliviju.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nawimexulusojiguveki.pdfIn PDF document text
    • https://mmszke.hu/files/file/faxoxudupafobam.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174da777b7---valosizuwalaz.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b82c2a6834d894aa49927f32ddf2c7d5/vunafilitalexe.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/pesuzefudevunupufos.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vlckll070iqn01id7fgdp6le/zegagolatojugila.pdfIn PDF document text
    • https://seerupit.dk/assens/file/75383318197.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/silejunufezipinazede.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b38ee781d---dodufuwiguborevunug.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7121c62cf07d9757b903fa97dfaf0f01/24395604956.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fojet.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a9fe99e498524909ee4d2fa462ef6069/6444430842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lyrics+juju+on+that+beatPDF 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://scripts.sil.org/OFLIn 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_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 4996 bytes
SHA-256: f50bc5a7bf4541d10c127b117cb71ce93732b46e3423a3db7466e4f98918c1cb
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 11304 bytes
SHA-256: 458b411140bc118264f44d3d7c39a84e32bbfb99bbd48c6d83134974cf7ebefd
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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