Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8c52018b793d1c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 00:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f152197f5c2f9a7000e992e8c5bed2a8 SHA-1: 690a79d0b6e2e19dc02acaa4ed95901ad3cff379 SHA-256: 1c8c52018b793d1c3f2ea4e79ebd6177b68802f1cd1c6588c3ef2a26304b3514
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable or potentially compromised hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a lure document designed to redirect users to malicious content.

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://a2hgghk.handylover.com/upload/files/seregafigekupopabul.pdf In PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/nalesubon.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/40897438262.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/webofedob.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416c786ff9e---15521866571.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e896cd56---nuvave.pdfIn PDF document text
    • http://patroha.hu/file/35490608010.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bekajupurisavexubipik.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210905033845.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca78c7957e---rokesaru.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/47872807374.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/vilutiruxev.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/89204023694.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/akqiv4eua6vgctgmfbhth9rrg2/gubazavazakajoxoronaji.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ih3abitlpocci81idlra1bqokj/fefilulotokadogajexidoki.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/72777062509.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479044978e7---73829101054.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/zifitisasofon.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/pegedonemonirusatovigup.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/gegesasudumora.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/fotol.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/79076385788.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/govotiguzodab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+king%27s+avatar+season+3+episode+1+english+subPDF 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 15084 bytes
SHA-256: 87390543f4ded5bb154e9a5c9e372b404d34910e4ac1ab609fca089a9a03f4a3
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 11288 bytes
SHA-256: 378774850804e6ad282bed813aa6b2542df52c8604d5a55968c3746a3c8f1fa6

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