Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bec0b4f2da1e52…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 19:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ca6d34232f6cdd5f9b8d663df45813e SHA-1: 047a61835f8c1f3be03f31fecc03777e91531d37 SHA-256: f8bec0b4f2da1e52ea6e93d4d27370e494f9307f6f611e64245b718120a10d5f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193e254fa0---20183552140.pdf In PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/93841231808.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fowuxewazawutaz.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/52929548513.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/9700028919.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/49760720844.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/xokiniputi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/98773587958.pdfIn PDF document text
    • http://martonelektro.hu/files/file/nedilijitezu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/42cf6f52406548fbb986ab9df1a5c98f/3071924156.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7294e48fd5---40531764214.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/6814866804.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9190be3b3---wulilino.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1cc084b505ed299eb32b3d662469a714/wibugifabegubokeja.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6867akjud4qlauanb06r0chhl9/nuxexidovirevamatoto.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/23677628091.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/filinuxurebodasaposan.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061722032973499.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/539ad4ba4c5c9022d791fa6ee2544aaa/15671237318.pdfIn PDF document text
    • http://herve-coiffure.ci/files/nopogifimoxebafula.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a59072c9d36---firegu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3d98660152c47ceac855488e245ced09/rulubipaziwulitenikun.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/zefejagevakevilofarel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pengantar+akuntansi+dasar+pdfPDF 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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16512 bytes
SHA-256: affc522f3fb33016e94e484a99f6548f5d868e308336672579eaf8f53532a5d3
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10700 bytes
SHA-256: bf8a7ff1fb245b350a0ba9d9142501f1e3491ce8efc7f5addf78c9536c631735
font_02_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1