Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd521628e55da5a7…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 17:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8adc9309b5a7f8ed68d6384e07ad5c15 SHA-1: 0761c6c9875382d16a322ca39a34f4e7f801d06d SHA-256: dd521628e55da5a7be1353060389fa5be38d1dad2bc415d5082bb410964f5b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI links and link farm heuristics suggests the primary goal is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=vidmate+apk+new+version+2021 PDF link annotation
    • http://castudio.eu/userfiles/files/zujivizoxofopananani.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lifejotivuwenex.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///9543163021.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/famugukamipowulati.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/13214765480.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/58648052982.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020430403835.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074b06b97e---80150917794.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/jivekuzew.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/85602517850.pdfIn PDF document text
    • http://adriennemason.com/assets/files/35792956328.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4dce68c39b7cf77494a57c1e38085e2c/13187914718.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/36317525580.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/50112378093.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/lejuxo.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/xodesewuxujejekuxoxo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfd4849ed---kobuzofamefofinasuta.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/41273125584.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e0fb9e68fe621fb8e210158db5f5b07c/mufodapesawewumiwowixu.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/wumoxurafefu.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/96220940005.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/46878543276.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 17192 bytes
SHA-256: b018b44ad468861f3e0042ec56ac55bc0175f7f5ad7b40772d177d0574bc81e3
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 11016 bytes
SHA-256: 4ce45b60c785158c2a5b408ac0c86154d9ab89ecd866857dde5affd1ab298dcc