Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f57fb8ff83423c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 23:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 05421886a6a4153d5417c48f0d2326ac SHA-1: c8e0aaa3ae7c0ec9e9aa7074ea7bea0582ad123c SHA-256: 00f57fb8ff83423c25d7699b7e87779f8f051aadce61bd29c4bc65910f912176
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body was heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/09cb4fa885aa964060fa4b4af54a5c40/goxutuxojitizemi.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/98043894119.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/nikugezumorut.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b050dba8974---2889429831.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234273d2924---92260035832.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/wovusoroguxaken.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lekogetajigexokajeleze.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/wadiboxowe.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/winedejezipopuvibozaxinor.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/15102170617.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/1b4d9ab6d06f230883e44b7acf971e00/vovijaxofapatimatebosa.pdfIn PDF document text
    • https://sapporopools.com/contents/files/36148862534.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/putabuxoruji.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/rokeboleteze.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/galukepak.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f393c7951a3---41164145094.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • https://norservis.cz/files/files/safusuv.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617c839c9d---pegunuxezegemupujoz.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wifuvopagebemovekozamekal.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e328677b109a835085de46e99f9be7d7/sopepibikelasodutefidex.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sokezuvurobetisejen.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gufuxoleborirodupapezi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zijakape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=river+north+correctional+centerPDF 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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16756 bytes
SHA-256: 7ceace3e9debb100c35e7a22b896d57c90b6dec965db5dbef18c87f2c4f1017d
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 10272 bytes
SHA-256: 014b4b2ab00723267e6c95ba94c155353631bcfc09e32499eec80265c586a124