Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bcc834ee7b8805…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 10:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d139d0a97869847c4514d7a5eec3d79 SHA-1: d67b691c20552eb427387ee7eb6429a824b357ac SHA-256: 81bcc834ee7b8805a53a9e9bf58e045285a9bf651a10eb7cdf35bd0c91c09703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, many of which are configured to host uploaded files. This pattern is indicative of a link farm designed to obscure the true destination or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5378ef72b---49449971204.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21eea59e3---veranoja.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/96a7b4886ee153980bf87b16829a799a/5704412741.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jesadop.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/27896513984.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc0475624---lanakonuxapegezusogol.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcceea300e---wesutif.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d727d0626---nububaseji.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/31073336835.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xaxojopomodarogozeselulol.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210610085825.pdfIn PDF document text
    • http://accronline.com/userfiles/file/43693282969.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c30970945f2---baxofodogepozuxerowagudi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/danodefisogawe.pdfIn PDF document text
    • http://charivne.info/images/file/likanek.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/42943408374.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e977f9bf9790accecd16c4d2614b9139/sogivebinimivuvusomoxan.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/rosipixetazovipovotuje.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/62831227374.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gipujebiduku.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/vewopesivukibowevutikizu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/karudukoliwiparowuso.pdfIn PDF document text
    • http://talleresjpg.es/img/file/papikexomedowobagedilabak.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198497b108---10869160337.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dd3718qs9i05ddoqiqvvjc02fu/gedoxizozifujoxapevigarob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=evoluent+vertical+mouse+4+wireless+manualPDF 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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10704 bytes
SHA-256: 338b387145286dce9190413a4c5c5287ffd11b940b7d0f7030eb8e5a62dafe95
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 17368 bytes
SHA-256: a84552b098bdca8b9969f42a6eed992b18d76e1a4574803930f0bc486098df1d

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