Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca930c9b04daa9e…

MALICIOUS

PDF

97.0 KB Created: 2021-09-16 10:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da9e5404d0b99379661baa695a9a09ee SHA-1: 6cc8a6f0a863be4903d712056f0e93a8382dde5f SHA-256: 5ca930c9b04daa9e6e6cd12eafbf1987149755cdff2be72f3053b6292613f5e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for further malicious actions like exploit execution or payload delivery. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pistant.ru/uplcv?utm_term=fabulous+lives+of+bollywood+wives+online+watch+free PDF link annotation
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • http://riviera.az/userfiles/file/roronedewug.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/19638451462.pdfIn PDF document text
    • http://chengzechem.com/upload/files/74352987021.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0176310001631443608.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/85132258763.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_193210.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/rukid.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/gobijejara.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/50599242740.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wodigagogezusib.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/difozodejifufapupixe.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/iph83eeui92uk4oljjbm7u42ho/gunotad.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wigagoxa.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/45421563521.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/41005631311.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/lebevaxewegowifabebeba.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/23390658494.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64863519477.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/xuratilikuv.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd1f3194c1a205c6626ace651307ef3/vomadanifoxakowijol.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/70065912258.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/pekegegalitus.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_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 19200 bytes
SHA-256: 246bd172e608c7125bb1e88f8a1cb5949d1b296d108a0b911b15ba50de9c963d
font_02_sfnt_off00015c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C09 11056 bytes
SHA-256: 1767315bdcc78e422e7004ec4c141dca5b0f50b95f0abb7e71fe37a85f12a18a

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