Malicious PDF — malware analysis report

Static analysis result for SHA-256 63061a2ea29ea58b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 06:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 153950e47cf5539153fc6da90f03879b SHA-1: 50d61eae0e0425fe22ef05db25a68f5943808831 SHA-256: 63061a2ea29ea58be1f19986433aad571ecd124d9de50aa08d6f0c2bc935f40e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa688fbb4---jofera.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf1db5b02e33592c3d6f2da306210e44/45857721848.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kudibexipunovoleraxabugo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mg1lrvi3t8cvsprcv33k444b80/30572765986.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/dituwepi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/571b4f2789826a2b0be315f3034d1bf2/1366643712.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/defatelepojulo.pdfIn PDF document text
    • http://asustainable.com/global/file/77989475038.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dalidebemufadipulukokun.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/60995668026.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qb14648g6tu0pm01hh9o8s8ls2/74410615353.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7145a5585d---32502544254.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/67197798187.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eda47f99b---xegafedamejuso.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xadosovugapaweru.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0950daa8586289cbb056f40a5e2a5abd/xobifaru.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sokanodone.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5fceea3b---vagitovifumokogo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/96866674420.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa02333aa---7581183906.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4eee29262ae7e3f2f7fa834f1be5c3a9/muwovijab.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/nidupijipukokop.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/zenatemeluremowejafazasif.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/gijujeziboz.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc430dc4f1---82473402041.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qs5v6uooejgeultrnq6a339m64/86288417611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=energy+products+partnersPDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 10748 bytes
SHA-256: 2e24c121f27b9ddbad295520e138b964888f4597a302f2ef863ec8372265c5a6
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 17108 bytes
SHA-256: a8f560d84511e806bb6ccd25efb0e271b50502ab7d372b5f5633526455d433ee
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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