Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58e53ec7d6ef435…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90c6eab405fcf34b8df8221eac3dce5b SHA-1: 90f83febc1f736917d09398cc860c6e61a8fa8a5 SHA-256: b58e53ec7d6ef43504d18472157a54fa6856db901cc8de8dbf310994c03a3be3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://poliinc.com/upload/files/59637858788.pdf In PDF document text
    • http://alacarte-design.de/userfiles/file/89890620438.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134788d7a5e1---rinemuwulu.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/sarezimikuxofubipuv.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/rojuzu.pdfIn PDF document text
    • https://vitanov.rs/files/kutemitimok.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/tevupomapowokax.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/wamemuriderizolonegod.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_A3A0E21423CDC1D0.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c04c629c---82842623025.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/10129046411.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210902174844.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/logugibuzexukuzikalofere.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/kazeroxovojegiwosomaxefaw.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zawenax.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dc96f4e---55956120131.pdfIn PDF document text
    • http://savemaxint.com/files/file/24643999109.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/14760346029.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/89067089244.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/gisoxorene.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e68l9bbfh0o2075c35402i8sf7/7160747484.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613285b72a373---pirulegibokono.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/rujugurujazesuvenubuxixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lightroom+app+is+freePDF 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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 18352 bytes
SHA-256: 785ebd78438895412c923b0dbacbe2e7017782979f9f5341e8e1a8dc476d6821
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10612 bytes
SHA-256: e105394dc2ee87224c84948a130141384122bcfbfab723bd780f6ae6c21dd9b9
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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