Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc38acfddb85720…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 08:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b71927aa6d7d0899a71cf94062e8bb8 SHA-1: c30a7ee83a8440caefe6166120938e37d1853beb SHA-256: cbc38acfddb85720ce0dfd5c5f01b76ae22dba9d552c5237074da20a4387e252
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bcb5d2e9d---29893557100.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qd2iheg1vchufqttstuckbse4g/42277911722.pdfIn PDF document text
    • http://dongphat.net/upload/files/munagixudimixibolepab.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/tajada.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/genuxepuriruwi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/44724481328.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/jezapavixogejemiwoju.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/tabuwebol.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/76652434959.pdfIn PDF document text
    • http://skrn.cz/pic/file/92087382137.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/dibutejofekajodore.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/50211040568.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/daramame.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/55568799632.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/83497348263.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/74937592012.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/27212409999.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dfd85d76611dce010adeb9d2ee4aae54/22003634729.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a0f005a3---61271034178.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/61533939084.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4894ba0---14618100729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+live+cricket+matchPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/gevumomamewusesavik.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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 15948 bytes
SHA-256: 1525454514768de370bc24f1497a3633837d763642c43417566deff5e139689a
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10580 bytes
SHA-256: f5f7f693911b25f47f95c5264a6b41c886557fc8a6134181c54d2456bd1b9bf6
font_02_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1