Malicious PDF — malware analysis report

Static analysis result for SHA-256 623bce12b75eda12…

MALICIOUS

PDF

81.0 KB Created: 2021-07-28 04:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bce14546bdde3461a94e3edc6c74fd23 SHA-1: f6005e4beb3eb7ad32ca9d0f2698da5da694ed14 SHA-256: 623bce12b75eda12b2c062240c2e3815a6030dbd1aef5c4856c276e988f236eb
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 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tamilsaga.com/ckfinder/userfiles/files/39704748594.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62d8acd31f5b4ea7ed6076a8fa8b2ae4/xofibasavuwejosopeb.pdfIn PDF document text
    • https://zold-kommando.hu/files/noxevisaxoz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0bsrdditkdk6jb2401282vhgq6/53505901340.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/voxiwoxitasera.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/zobaxabonozudolered.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6c97271ea---29583898767.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/06bdkmnhsabvh6jdd0td02vgmn/fapexomipubaxapuwoninawe.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/guxagipotixosi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/i4q6e5cn3966hagnm1n3sl17t4/15416799604.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/33205120677.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ieb7g132o246tir59nm18muj3/raleko.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/32768606375.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f667b3c16---porelefakusamupo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aebb36fef---38910443465.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc561694ae2b55ca6405b46b7f2a01c0/watitawepukulekero.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/6063571127.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a613e7166ad---sisori.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gamovodugenulisowibup.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/204c20256dc9b6bacd59f03a631ca770/vonopadebov.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/gibuxenepiximijinaviran.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aa06c018---faripo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774ef3a23eb---76220837401.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/21851543444.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54ade68d9---81597696505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=synonyms+and+antonyms+for+ssc+cgl+exam+pdf+in+hindiPDF 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 11356 bytes
SHA-256: e9f20e165fee3921dd2fec482e051cc982a6a9b35976f1c0467b741af305b260
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 17040 bytes
SHA-256: c054fbaf81b7088c690c7c227e9fd76ff6348fe6a51b18a66a54a0567bbf058a