Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b520eb2438811…

MALICIOUS

PDF

80.8 KB Created: 2021-07-17 15:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01da29cbae1c23d0a81eb5fbb14ef341 SHA-1: 4ea2f254286a4993291fcb2c31f69c23f842b2b4 SHA-256: 308b520eb243881120447c824e895efae98e246df27be880f5994ea19d4636d4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700601b0d89---82786991627.pdf. This pattern is commonly used for phishing or distributing further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bpabv.nl/uploadfiles/file/wewimebidogarosonuwolebak.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/88295263298.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fizasiw.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/v955956dc9hkocs4tce6gmj5vp/zebexixovawukimi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/9364444903.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb94d07ff68---pigamevixoku.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tiporefenokedulirexim.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f11cfd79---metolipuwubigisun.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700601b0d89---82786991627.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/3410181939.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/60811779956.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0618b9bec---sisudogajinuzobi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160855f6b3958b---68518171543.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/30351131344.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/85253438481.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/33858190061.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/bemifozonesedojexota.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607742cf9218c---nifoxesimubafurelagapopi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6a5b83491ec84aec298d913ec13458f/dotipowod.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/xewegabipuduligepesobona.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/44250262956.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741c5194---sibisebuzusobuzimegaguje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=suggestion+bengali+meaningPDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16384 bytes
SHA-256: c7f4e108120774942dfaede609a3edbbfe0c39dcb9e735a0aca0b0c4380a7764
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 10664 bytes
SHA-256: 2cc0892713bc47268e86332b57b0ec9ae8a0b501227f05d46fbfefb907d854f4

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