Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e1f102ba7d3157…

MALICIOUS

PDF

108.0 KB Created: 2021-07-13 16:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d72709013809e526502fa6b2e7cc49fb SHA-1: c230296c3b342db16830134677bb3b401b983fe2 SHA-256: f1e1f102ba7d3157909e0f0129e2398dd4fde422f7f9387ab0eb67d9f23e2cf5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4e58b701---xetejulezodat.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c1a4cc02---53207750240.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/p2davlnpkn7atfualhg7kpukre/selijidemaso.pdfIn PDF document text
    • http://premium-t.info/files/files/24663134169.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/14116654777.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tolinitolefigevenek.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/malojarobobarinosame.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c7b1c26bfa111ed302eeef14e9f5e348/77343245216.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/46fa0d47a714b322ccd92070ce2ac277/57739138186.pdfIn PDF document text
    • http://yuhongzg.com/d/files/limazoj.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/16188104965.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jazaxox.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4dbba4be---13988000707.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6c925d2c---8077252025.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/wesadirabikaxomofime.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/368d83f812419d68022fd647674a27b0/lipojubex.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecccb97c0a---tevokoguvobe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/19781180841.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcba448176---sevite.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/64864195172.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c5f618cd9---34592480743.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098002aceb---81459929521.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/25925867402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=advantages+of+centralised+curriculumPDF 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_off000143c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C7 17472 bytes
SHA-256: 8e90036836912736e135cc950d24d2108d8f80efa6f60fe8a783ed5096e09bdd
font_01_sfnt_off00017162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18979 10964 bytes
SHA-256: d84c3ef9c27874863fe98b779200cc04a86816ae8ac4e651030b1d1da5a73068

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