Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb12e197f3a9756…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 10:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcfd3a62b14f5feb1ce1776d363fbe36 SHA-1: 0ba13798a68d58f9228be44c6ed8b124ef19b8fd SHA-256: 5fb12e197f3a975608f9ce5b633da73f08ee76a96bfb00be10c2f004e914b734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e778b69847---88289735779.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/betokuwusajagoxujiravoki.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jeligazavaka.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/8455055113.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bazolutus.pdfIn PDF document text
    • http://cosyromania.com/media/file/96024945428.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/20441738452.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/86035544527.pdfIn PDF document text
    • http://coumert.com/images/file/28970393590.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1070jvcq6eut6gh3g0sc7fqcqf/8549899828.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/26415824992.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/52669983123.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/50097766455.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/80366710553.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087ada8bc074---podoj.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/38412612318.pdfIn PDF document text
    • https://olterus.info/contents/files/timepimoponino.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/buduludepuja.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6627b072f6---42649915230.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9551cba6---dorolomupapuni.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jogizudijike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=revised+academic+hardiness+scale+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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10776 bytes
SHA-256: b45f26781e70e5be9be8797707a4305f9f96a8ac11c0de5a3d537536b78b5ce9
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 17952 bytes
SHA-256: 6a84bed110c28e6e1d6beb0ee715d282c7b28b0c7a0a5106b2a9df77fd05a64f