Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a78ea97a2b016f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 00:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b3d9b7162a13440425cac3042fdfbac SHA-1: 9980437266f00c79fa435148b37aa517347cd1e4 SHA-256: 23a78ea97a2b016f4fa26432b8b4500c0f5ffe0956bd40f86e2a3b9f82245c10
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be to redirect users to malicious content hosted on these sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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 http://www.annaleehuber.com/content_files/file/52416744469.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ef89da5566531ed47536ae90a8c83c11/84124056590.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46f7c07cbe---69335502076.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1mrd130d1j32mmfgnniab4rti6/46731931219.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce021b8247---83224026326.pdf
    • http://doubler-son-capital.com/photos/files/41856510720.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f21fb078eb15774db48ca59dd56dd883/zaxifovatizamofamomameri.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e84139af9---bovukidojezabejuwu.pdf
    • http://hongshengfish.com/uploadfiles/20210521/210521195630055851b3mtjligef6m.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6a44551b67329c1a7ab8ac05f7a52424/vukivaj.pdf
    • http://escqatar.com/uploads/userfiles/file/file/foduwubimenazexet.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/sutupikegaxozima.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9619bc19d---zoxalava.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9968a74dcf8c7494e30f50fe5426dba/25151322169.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/1765850180.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a603e01d43f---joxuxederijugefuzi.pdf
    • http://jikaramen.com/uploads/files/rinabepitonowupuxaku.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/bixew.pdf
    • http://www.peretprod.ro/content-images/file/tedenomubulujefufidebazof.pdf
    • http://aranykoronakft.hu/userfiles/file/sexigilowasesefegumubo.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a4476fe2814767f247ee5a4624b90cad/rakukazejuna.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b5243e1c---migiwomuxijipibepebafewo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3d97e80de535bd021a6cace01c57c4a8/purajano.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/44324abb93582de74698e5073a3b5294/89805283587.pdf
    • https://ntct.dz/ckfinder/userfiles/files/7210077153.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=harcourt+decodable+books+first+grade+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a2.bin
aedf758cdf627b42e1881c90198ffaf005d4b5a97b3559bf1f0cf7c077bcf865
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 17504 bytes
font_01_sfnt_off000111ba.bin
c35a710ff6cc6884be5c2e672e2ca341e2e89ba046bab6f2fac18d48c95ea3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 11012 bytes
font_02_sfnt_off00012b00.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16092 bytes
font_03_sfnt_off00014045.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14045 16792 bytes