Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36f1b7cde391723…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 20:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aa59b17d547cab0c571df6f923b96e00 SHA-1: 97d7526bf53e0490efa6572c5e79e274b9e0d29d SHA-256: f36f1b7cde39172335cfba8cbf25a0b762d33be074b72547a05a5932fb5734e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress uploads and disposable domains, designed to redirect users to various PDF files. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ac1d073d9329f179830a4cf0bf94bd12/tupuzeduxem.pdf In PDF document text
    • http://kyanite.tv/userfiles/file/57913449719.pdfIn PDF document text
    • http://turatabor.hu/media/letojovevefuzemosezeruvu.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/25499599684.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/lefukowovuwukinesaw.pdfIn PDF document text
    • http://fitviewer.info/files/file/41897588962.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/emt22eiuuhea1af10d2ren6l33/17403546735.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/73604290644.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/pomuxevowozutanono.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/25607312547.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tutemogakavogefep.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xunogawadujova.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/davazudixuma.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/xigamorogivopodijodegeli.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/31041964722.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/rakemigexafewewe.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/93247819608.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/tonub.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/88239161625.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/nobapizi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2533e695ce68c40026061bed6a77c112/62077813265.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d80980770---gutugosa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe99d01f---64800802689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+redmi+8+price+in+bangladeshPDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 18228 bytes
SHA-256: 73880c58c293bb719385bb2ab0d8ff852721be678e6831fd62479ae05afe38b1
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 11136 bytes
SHA-256: bfa649fe4176ee1acfbfde4ea7ed0c4dc74a145d7fb8e6ec9e8dc976d87b434b

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