Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e2799fab08f628…

MALICIOUS

PDF

86.3 KB Created: 2021-08-13 17:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4f3a870cde7fd488b68eea984f17e24a SHA-1: 59be9515a313bc4464a4e8c66011b61f8d473478 SHA-256: 19e2799fab08f6283fdf0676008898fb667bfb4afc1edb26dc3f7af57cea0ec6
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 0.9952

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://huntic.ru/uplcv?utm_term=mortal+kombat+9+psp+iso+download+free+highly+compressed PDF link annotation
    • http://autoscuolavalerio.it/userfiles/files/59819648637.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f65bf3d05---fotiwagozakiveganobozasej.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50c270b2e224522ee41f542fe3399217/fujobomolikixe.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/81067893149.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce585caeb---zukulotogagoxuruwokex.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9k7qm77fvt1futeq77es4tl8c/vobapunojexiva.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5c0b32120d37381f59e377141ea8ec7e/32403999252.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c25f8d472ce---18112926360.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0fpvjjh6d4jnietsgeli0qe1c2/58138618101.pdfIn PDF document text
    • http://talleresjpg.es/img/file/doreridelawotufitozun.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a78c36812f07bc987b794150919aaa43/19435117615.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/52857904974.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/23495151061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f068640073---96690101566.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/84351038804.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/43183383917.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/11964ea2933855004c99db9900cbd387/pibagodaposux.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf87c2bfd7---bedozen.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/tozejawametojafi.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/82057530123.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/wobuxedozokudusadito.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/16640838396.pdfIn PDF document text
    • https://europartner2.pl/uploads/87758036766.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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 17252 bytes
SHA-256: 69ee73a874336de5243a431587f150266499e9afe863f1dcad817ce1b25ffde0
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 11660 bytes
SHA-256: dd6337d029df0d6e29de27c81569ee6a86e2d02677d1d0a4131a19efcda7de53
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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