Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a73a821e9b821…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 06:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c88bb2a2b004300cd174176dc831f020 SHA-1: f0d075008ea6087d3a37c8c9219dcec2e8266924 SHA-256: dd0a73a821e9b821a53e6aaa0076b7e715410be606d5b9e6bdd10200662e690c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=the+witcher+3+can+you+run+it PDF link annotation
    • http://p-itos.net/admin/userfile/image/file/zixakuzewajeg.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1rhs3mcu98vvrme0avii4qh1hm/31697541010.pdfIn PDF document text
    • http://unsersohn.ch/images/file/3520314481.pdfIn PDF document text
    • http://vladekoservis.ru/files/kopipuwapuvijolo.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc64ad023---21601781779.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/bexizilolebukibagunotuxo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351cc06f729---sidilusalifonifanabudapo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff924f13---55497846982.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/jifenis.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/47534303943.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/81618196261.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/10366719020.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/fefarokuvolivomol.pdfIn PDF document text
    • http://popmetre.com/news/files/64346261246.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vatapelarazawoluzalere.pdfIn PDF document text
    • https://506hlapeta.com/files/file/fejewumiwigakuzetade.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/mevowimewowomedut.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/vorubizigo.pdfIn PDF document text
    • http://www.polni.si/Images/files/57938896329.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/veketofobaxuvifomijik.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/57345219301.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4758775a---95119511147.pdfIn PDF document text
    • 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_off0000b1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 15776 bytes
SHA-256: 30dd4346760d46632e173fb1240f58aee691cde88f72dcf0a5e41edee66e8256
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 10548 bytes
SHA-256: 198393e7de17fcc50094d151802ccb636a76faf46b5cbee6c7c37c2fbde6748c

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