Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a0555b7efc3535…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 14:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5199382cf16dabb7e4fa46beb5c38e7 SHA-1: 2c5b782e8472d719600983766fdef26fb9dd87da SHA-256: 36a0555b7efc35359eccb46dcdc822e734d378ca8785480522152f4c0674cecf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm characteristics strongly supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://konemara.hu/userfiles/file/galavolaroxovobi.pdf In PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zetemapagexudiranapaj.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee14fa8972---vupaloj.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/umv4m3qghvmomiamoa65m2k63d/wiruguzatiku.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/nokotige.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/64280846290.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wamosubelawik.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/tezig.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/loxuno.pdfIn PDF document text
    • http://debten.net/UserFiles/File/24751304653.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/nulijadadojevevevur.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/bewak.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/21114716199.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/dusawu.pdfIn PDF document text
    • https://miet.hu/kepek/73909634779.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73d6a1b84864f30022604c400ece8ab3/10752809282.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/finaxapivunodajeta.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/7751535536.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143edbe41c9b---8044356828.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/84221598178.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/69177174471.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/58a357508ae594043eec1675c352fda4/rabuloj.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/jenazemazisiv.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/xijekem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+walking+dead+no+man%27s+land+gamePDF 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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 17900 bytes
SHA-256: cb7f9c3ae69365a9a683f1b1bc3196952ce847474ef06defed1d72b8a9d39b93
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10672 bytes
SHA-256: b86d160317bde8ad7898178b827f03b6dd2c98659a327abf043259c349d69211
font_02_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1