Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbf1fc6400cf712…

MALICIOUS

PDF

90.9 KB Created: 2021-08-18 07:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 964c8ede4fe56c9dea1abd3679d032b6 SHA-1: f5b336318c52b45fc4bf3f698fd2c9aea0544ac3 SHA-256: ebbf1fc6400cf712928fa9a8a292d6f38e72061868e75a0b43d02ace5de80e88
164 Risk Score

Malware Insights

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

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=how+to+get+unlimited+keys+subway+surfers PDF link annotation
    • http://netcentricnj.com/ckfinder/userfiles/files/newomo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eefd69089---24481776079.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160700b6694321---58454483638.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56ce6ae8c5---11574915150.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/69533c049e97e508b0101099b012ab25/26568798222.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/47665451094.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e627ebe2---nabefepivamuzipekovi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611aeaf818a39---83445452305.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/3409228413.pdfIn PDF document text
    • http://leskovec.eu/files/file/58900063047.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/pesadosedoraraleru.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc4d4ae33---fevekaxetunugumozejode.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/29mroink0f1e470cvb3v734h8o/13947146125.pdfIn PDF document text
    • http://chayka-svg.ru/files/42636856181.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f407b8058---79588520810.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/pavavitiwubom.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33aded86---zemomopaxemuze.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/feb0104ef4bd066bc3171b4089943194/tufusara.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/17780103054.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/ronagometobij.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/kulisudowurafe.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/57966300412.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5b044ffa---remewirabebosokajipimuxa.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/fasobomokevili.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/038150e7201de91a9d1372cb7e98868a/sorir.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5872fef4---60185317875.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_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 11220 bytes
SHA-256: 2fcfc1d4ae010c45b847c82800d93713e2e9a53456bf67b2b1314b9461cf2bc3
font_01_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16564 bytes
SHA-256: 475641b21cb7edf4886fcefcecafa76a91ff7255aaaa18bab3f5254b498ec7e7