Malicious PDF — malware analysis report

Static analysis result for SHA-256 5588db8a06f2c7b4…

MALICIOUS

PDF

87.0 KB Created: 2021-08-25 20:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30557d4bc9d6fdced4035e340d9dfda5 SHA-1: 2697389f74cc81a090666b5fad92f56c234fe900 SHA-256: 5588db8a06f2c7b46cb7c20a8e34d79922f6941ed34fc379d14db4dfb73b8f20
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that points to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external URIs, many hosted on compromised CMS platforms, supports the attack pattern of leveraging a link farm for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.alborada.es/ckfinder/userfiles/files/jugimirel.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538c23430d---86724768275.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/s8k42koo0m8mr20t0quprnn5bk/xewuwuxanimun.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0c553d6a37c24b5dbb19375721b650f2/nepomanijolunelorep.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/lbd0q6mfmk6rs21j3qrlp2j5uo/94293154566.pdfIn PDF document text
    • http://mamam.by/upload/File/file/98485963647.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084950f8c117---kelavuru.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19e41980b---lejumasemafubetovin.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fefdd9e9c---zunejugifagisugala.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/sarawaxakoboruzewija.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/64015085661.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/21043178819.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e1523404d4bb44f5d1543500193fce78/defamurowoxagunezuwivap.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd739db184c---71295544878.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bade4bc6c5---dazomamirake.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16107e2af4e5e2---2294957627.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/risozugel.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/97427552038.pdfIn PDF document text
    • http://ministerium.pt/files/20861120436.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/nevuzepafekil.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/jesamaviwufudufagijuna.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/juzigo.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vukapa.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/gedika.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a422826cc5c---83618302659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=formula+of+time+period+of+a+simple+pendulumPDF 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_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10736 bytes
SHA-256: 2b1a36078b6bd0e89fc733a1541174418b477127152be14c8fd295aceffdb258
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 18220 bytes
SHA-256: 06a6cc27070140dfcaa97a6c11b3f42c7d8c5cb4249b81c87727301211ebee6e

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