Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55c14f34963b566…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 18:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e11bb939a392a01f3547668b5384987 SHA-1: e2e3b6ec95bca3f6d8c0387e0295857e68bef825 SHA-256: e55c14f34963b56651ef7bab2d0ca4cec253fc1c1dbea55c24f45dd3ea323336
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The PDF structure and the presence of link farms suggest an attempt to lure users through deceptive means, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/139d307e91a2137072af5fbae6b32d40/zubusuvuxufejelegi.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/vumefifapakeguneg.pdfIn PDF document text
    • http://aa-nusd.jp/rejegetidibivosupef.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkonlbmlk5j70l1fo0ek1a37m8/51758660310.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dce39458ca---97393908896.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tc09cap1rshdgsnqk57voavckr/xepig.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-26/20210626150645111797.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c96bb6316ce61f0726e80c1b1ca7aeb2/maxuzanemudakajud.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6a6c0b72---jowololosejakojipirijatox.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/26001e248d2de4734d19fc52d14ac56b/36858136357.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b33393907c---33778495330.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210819_63E1966834EEAD4B.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7idh940ejet1l95717cnk90gkq/22304357184.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/lumovigi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4542794ee---xubozafatagozagidulaxezo.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/2911148404.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/wosaxopaxanasas.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/nolezekawuxuxul.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240b4bec72---60958095156.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/6867864710.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/rizawirodamepagopam.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609464f4dc786---rofujedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=diode+circuits+solved+problems+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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 10824 bytes
SHA-256: 17534d9124dd1d682a0ab40d7088d425a3b97361647ccd859953167ab3fcc80e
font_01_sfnt_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 18296 bytes
SHA-256: 42e0fcadb9c98c241cdb878c92bd313d409b441c65dcc2903dacdc5f5ae2aa63
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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