Malicious PDF — malware analysis report

Static analysis result for SHA-256 e704f93bc2479f45…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 20:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 526d4f5c73dee4f937e7df85fc7b691b SHA-1: 5da7b12fcaa57e06036112a7f64a0eed642de85a SHA-256: e704f93bc2479f45788f0b7aef2fc7c6234c36eaf0a95b95e014db8e453ee8d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple links on potentially compromised CMS upload directories indicates a deliberate effort to host malicious files.

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 http://zaun-produzent.de/userfiles/file/35558346049.pdf In PDF document text
    • http://anipetkingdom.com/webroot/img/files/14468799145.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/duxitejilizemevogenuz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/da7bc7063902ad121f796d31c744f31f/pazoxazumajowidikugu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/eb802d8b2ec896c627791765bb212307/38891036271.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/84260042054.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/36f522ee0a306757f1654aafe5dc7feb/tarozivumakinifimijim.pdfIn PDF document text
    • http://goldmustang.com/files/files/rotelozevosopalas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f357e3370---74997679357.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/nopuvugotitatubazefosafe.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/84175206b0a1a807e6a6febcc946732e/nozaxupumorariga.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/xawamunuge.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e645d53da---46860313656.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/gerexufufixil.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/db4c56182cdddad6b5ca88db77347619/miwiwovosafudot.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7c4hml6oneqbs62st9q2g91uef/dajegididadofoko.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/50c12954161edeeaa234c24744684ca7/74531745110.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/kadugifo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nn62s80gb3nhg4ea16f1aq360p/21882124297.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080964df1df5---mujoburisub.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210717_DBCE4C98924E8A72.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vk143ompaqa9sn9k7df9qksn33/54542780295.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606d0f55f34d9---limedofoperunijub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=puppy+howling+at+nightPDF 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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 10432 bytes
SHA-256: b8bdfdb06769a35bde913d7a47f708db5be0de89688603f7abdf21cb64535ac5
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 16924 bytes
SHA-256: c8cb703dd79dfbc63a5949cc38c2f3b481602d28eaf67e56bb9262f3571ba907

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