Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f47c1defa2a701b…

MALICIOUS

PDF

92.3 KB Created: 2021-07-19 04:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 853ded34aac7e388a19395116d3abbe5 SHA-1: be3898d2b664e511fb12a005f9cb83ae717b32fb SHA-256: 5f47c1defa2a701b041edb0b36890d2e3a97a3526ae49c48cbcd6fef458cedde
176 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it acts as a link farm, directing users to compromised WordPress sites hosting further PDF files, such as http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb89e76b5b---5965342597.pdf. This suggests a phishing or credential harvesting attempt by luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb89e76b5b---5965342597.pdf PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qnoeggn68mf51b4t73ur5sobi3/53449825144.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gc2jja34rvgco8bfdmjqhg70jj/36430695671.pdfIn PDF document text
    • http://sy-smile.com/upload/files/kuzuvid.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9731eaee---97692853013.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160852de6e124c---ximirekumamugugomi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/32743373a806b5c8202846cc8b516034/lagamolowuxulev.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2bfe6a2554205fcfb3a6d6db08b8e68b/poxuretofedebelifedumezo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/74047925090.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f661bb4acf926b607b98e673ab0d65be/tokudurasunezigipiwat.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210621232603_tk3dxr.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17faf86b1b---25474767011.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9005482bf6---zerowidudij.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/12147408842.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde07483e7---pejapekezudelidugibuxifi.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/wojozavoxomuxevo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062106242380554.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/89345818214.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f3a9a958635e20b2d66ed00f33c3eeca/pavasowewazujabuxadimire.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dejemekizar.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7899705d9874a807149ce792b68cae6e/lesevojeme.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a067205bd42---kamudurumosenomerinijejur.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/95325335721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+prevent+copy+paste+in+pdfPDF 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_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 18332 bytes
SHA-256: 01136d5c359310cb7d6ab0c86ade18f936de3d5b90e443ec6d29c73fd09390e5
font_01_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 10824 bytes
SHA-256: 69b638a72b7eb0e41a75274ed56c90a1f52249098adb02239f4382df4fe4a6fc
font_02_sfnt_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1